Physicist – Radiation Oncology - Full Time NewYork-PresbyterianPhysicist – Radiation Oncology - Full TimeManhattan, NY$233,000–$279,600 / yearNewYork-Presbyterian Hospital/Weill Cornell Medical Center is seeking a skilled medical physicist to join the physics group of an expanding department of Radiation Oncology in a patient-focused, high-tech environment offering leading edge treatments including a newly installed Icon Gamma Knife, MR-guided treatments, OSMS, ExacTrac, INTRABEAM IORT, TBI, HDR treatments and LDR implants. NewYork-Presbyterian Hospital is one of the nation’s most comprehensive academic health care delivery systems, dedicated to providing the highest quality, most compassionate care to patients in the New York metropolitan area and throughout the globe.
Physics Educator (grades 9 -12) Start Date: August 17, 2026 KENT PLACE SCHOOLPhysics Educator (grades 9 -12) Start Date: August 17, 2026Summit, NJFull timeKent Place School is seeking a Science teacher with expertise and experience in teaching Physics, enthusiasm to collaborate with an inquiry-based department, advise a group of students, and to participate in community events. We seek candidates who support the development of a school community that is culturally competent and a working environment that is affirming and inclusive, where each member feels safe and valued, as described in our Belonging Statement .
Leave Replacement Teacher of Physics School District of South Orange & MaplewoodLeave Replacement Teacher of PhysicsMaplewood, NJ$70,000–$100,315 / yearWORKING RELATIONSHIPS OF THE POSITION: To maintain effective relationships with teachers, students, parents, administrators and appropriate community groups. NJ Teacher of Physical Science, Teacher of Physics, Teacher of Chemistry, or Teacher of Earth Science endorsement preferred.
Adjunct- Physical Sciences (Physics and Chemistry) PASSAIC COUNTY COMMUNITY COLLEGE (INC)Adjunct- Physical Sciences (Physics and Chemistry)Paterson, NJAlternate Benefit Program provides eligible members with a tax-sheltered, defined contribution retirement program, along with life insurance and long-term disability coverage. An optional Transit Pre-Tax Plan is available which allows employees to use pre-tax dollars to purchase eligible transit expenses.
DIVISION OF SPECIAL PROJECTS TEACHERS-PHYSICS TEACHER-PHYSICAL SCIENCE Elizabeth Public SchoolsDIVISION OF SPECIAL PROJECTS TEACHERS-PHYSICS TEACHER-PHYSICAL SCIENCEElizabeth, NJ$65,146–$113,661 / yearCompetitive benefits package including sick leave, vacation days, personal days, health insurance, dental/vision insurance. Applicants interested in this position, click on the link below.
Physics Researcher - AI Systems MercorPhysics Researcher - AI SystemsNew York, New YorkRemote$125–$225 / hourCurrently or recently in an active research role: PhD candidate, postdoc, instructor, faculty, principal scientist, or industry researcher. Identify areas where current models fail, especially mistakes a working PhD physicist would catch.
Anticipated Opening - Chemistry or Physics Teacher - High School - tenured track position Clifton High School (New Jersey)Anticipated Opening - Chemistry or Physics Teacher - High School - tenured track positionClifton, NJAnticipated Opening - Chemistry or Physics Teacher - High School - tenured track position JobID: 2069. Position Type: High School Teaching/Science - Chemistry.
High School Physics Teacher UNCOMMON SCHOOLS, INC.High School Physics TeacherNewark, NJ$60,000–$90,000 / yearTeacher certification is not a prerequisite for consideration at Uncommon Schools in the state of NJ, but you do need to meet NJ state certification eligibility requirements (a final undergraduate or graduate cumulative GPA of 3.0 for graduates on or after 9/1/16, or 2.75 if you graduated prior to 9/1/16). You'll teach a curriculum that includes, but is not limited to, analysis of Biology, Chemistry, Physics, and Environmental Sciences that prepares students for Advanced Placement (AP) and collegiate level coursework.
NewBiology / Living Environment, Chemistry, or Physics Teacher Mount Vernon City School DistrictBiology / Living Environment, Chemistry, or Physics TeacherMount Vernon, NYScience teachers in Mount Vernon City School District (MVCSD) schools will: Prepare all students for success with New York State Regents Science exams; place an equal emphasis on developing scientific thinkers by inviting students to ask questions, develop models, carry out investigations and analyze data. Science teachers in Mount Vernon City School District (MVCSD) work with a diverse range of students to develop Biology / Living Environment, Chemistry, or Physics content knowledge and skills through exploration/experimentation, reading, discussion, and writing.
R.I.S.E. Gen 1 Student Tutor - 2026/27 (Biology, Chemistry, Physics, Anatomy & Physiology, English, Math) Seton Hall University, New JerseyR.I.S.E. Gen 1 Student Tutor - 2026/27 (Biology, Chemistry, Physics, Anatomy & Physiology, English, Math)South Orange, New JerseyThe R.I.S.E Gen 1 Peer Tutoring program provides program participants academic support via 1:1 tutoring, group tutoring and academic workshops. We are looking for students who can tutor their peers in English, Mathematics and/or Science related-courses.
Adjunct Lecturer, Physics and Astronomy Barnard CollegeAdjunct Lecturer, Physics and AstronomyNew York City, NYThe salary of the finalist selected for this role will be set based on a variety of factors, including but not limited to departmental budgets, qualifications, experience, education, licenses, specialty, and training. Job Description: The Physics and Astronomy Department at Barnard College seeks a part-time instructor to teach the following undergraduate course during the 2026-2027 academic year.
Physics PhD - Research Collaborator MercorPhysics PhD - Research CollaboratorNew York, New YorkRemote$70–$100 / hourDesign challenging, real-world physics problems in areas like classical mechanics, electromagnetism, and quantum mechanics. Currently enrolled in or recently completed a PhD program in Physics or a related field.
Physics Expert - Fully Remote MercorPhysics Expert - Fully RemoteNew York, New YorkRemote$70–$100 / hourDesign challenging, real-world physics problems in areas like classical mechanics, electromagnetism, and quantum mechanics. Currently enrolled in or recently completed a PhD program in Physics or a related field.
Physics Teacher Glen Ridge Public SchoolsPhysics TeacherNJThe successful candidate will inspire students through engaging, inquiry-based instruction and foster a rigorous learning environment that promotes scientific thinking, problem-solving, and academic excellence. Candidates with experience teaching multiple Advanced Placement Physics courses are strongly preferred.
Physics Teacher BelovED Community & Empowerment Academy Charter SchoolsPhysics TeacherJersey City, NJ$70,000–$95,000At Empowerment Academy, we emphasize teamwork and community and truly value our faculty: Evidencing this, compared to those with similar experience, OUR FACULTY MEMBERS ARE AMONG THE HIGHEST PAID IN NEW JERSEY; Moreover, we seek to achieve academic success without burning out teachers by meshing an effective education program with effective teacher supports and professional development. Our teachers are part of the New Jersey Teachers’ Pension and Annuity Fund (TPAF), same as teachers at traditional public schools, and can transfer their pension credits from a traditional public school to our school and vice versa.
NewTeacher of Physics (Leave of Absence Position) Hopewell Valley Regional School DistrictTeacher of Physics (Leave of Absence Position)Highland Park, NJThe information contained in this job description is reviewed and approved by the Board of Education and may be modified as district and state requirements evolve. Salary and benefits as determined by the Board of Education and any applicable collective bargaining agreements.
R.I.S.E. Gen 1 Student Tutor - 2026/27 (Biology, Chemistry, Physics, Anatomy & Physiology, English, Math) Seton Hall UniversityR.I.S.E. Gen 1 Student Tutor - 2026/27 (Biology, Chemistry, Physics, Anatomy & Physiology, English, Math)South Orange, NJThe R.I.S.E Gen 1 Peer Tutoring program provides program participants academic support via 1:1 tutoring, group tutoring and academic workshops. Gen 1 Student Tutor - 2026/27 (Biology, Chemistry, Physics, Anatomy & Physiology, English, Math) South Orange 2 Oct 2026.
Physics Teacher Beloved Community Charter SchoolPhysics TeacherJersey City, NJ$70,500–$90,500 / yearAt Empowerment Academy, we emphasize teamwork and community and truly value our faculty: Evidencing this, compared to those with similar experience, OUR FACULTY MEMBERS ARE AMONG THE HIGHEST PAID IN NEW JERSEY; Moreover, we seek to achieve academic success without burning out teachers by meshing an effective education program with effective teacher supports and professional development. They receive career-long coaching and professional development support from school leaders; work with their peers in professional learning communities (PLCs) to plan lessons and solve problems; and partner with an array of specialists to meet scholars' diverse needs.
2026-2027 High School Physics Teacher Coney Island Preparatory Public Charter School2026-2027 High School Physics TeacherBrooklyn, NY$71,250–$97,750 / yearParticipate in school community responsibilities such as lunch duty, dismissal and hallway duties, daily homeroom, bi-weekly advisory groups, weekly content and grade team meetings, whole-staff professional development, lesson internalization and practice, and office hours once a week. Scholars dive into a rigorous curriculum rich with AP courses, College and Career Readiness classes, all in a supportive, small-school environment with extracurricular opportunities from sports to enrichment clubs and leadership opportunities.
AI Trainer - Graphical Abstract - Physics (Remote - New York) Prolific Academic LtdAI Trainer - Graphical Abstract - Physics (Remote - New York)New York City, NYRemoteWe've built a unique platform that connects researchers and companies with a global pool of participants, enabling the collection of high-quality, ethically sourced human behavioural data and feedback. Our work supports global organizations with high‑level corporate intelligence, and we rely on executive‑level expertise to validate complex Materials Science and Graphical Abstract data.
NewHigh School Physics Teacher Forte Preparatory AcademyHigh School Physics TeacherElmhurst$65,000–$95,000Full timeForte Prep Academy High School is a new 9th through 12th grade college preparatory, tuition-free public charter school for Queens, New York, with a focus on serving the Jackson Heights, Elmhurst and Corona communities. It will also be a new home for events and sports for our greater community - we aim to open our gymnasium and rooftop athletic field to local classes and events, grounding the new Forte Prep High School as a true community partner in our neighborhood.
Miscellaneous Wage, Administrative Program Assistant, Physics & Astronomy University of DelawareMiscellaneous Wage, Administrative Program Assistant, Physics & AstronomyNewark, New JerseyDelaware Space Grant Consortium is seeking a program assistant to help with organizing electronic program records, improving communication with our students and faculty, and hosting program events. Collect and electronically file student application and report submissions Update student data spreadsheets.
Physics Researcher - Fully Remote MercorPhysics Researcher - Fully RemoteNew York, New YorkRemote$80–$140 / hourSolve research-level physics challenges end-to-end with verifiable derivations, code, and peer-reviewed references. Audit submitted solutions for correctness, scope, and method soundness; deliver actionable feedback across iterations.
Physics PhD - General Relativity Expert MercorPhysics PhD - General Relativity ExpertNew York, New YorkRemote$70–$90 / hourDevelop high-quality data sets by creating challenging problems in General Relativity , Astrophysics , and Cosmology . For details about the interview process and platform information, please check: https://talent.docs.mercor.com/welcome.
Part-Time Instructor, Physics, Fall 2026 Rutgers The State University of New JerseyPart-Time Instructor, Physics, Fall 2026Newark, NJThe successful candidate will cover the full range of duties associated with teaching, including, but not limited to, preparing course material; creating and posting a course syllabus; presenting material during the assigned course times; holding office hours and providing appropriate out-of-class time for students; responding to student e-mails; conducting and grading assessments of students through assignments, exams, and other means, in a timely manner; and submitting final grades. The Department of Physics, School of Arts and Sciences-Newark, Rutgers University-Newark (RU-N), is seeking part-time instructors (Lecturer/Coadjutant) for the Fall 2026 semester to teach physics surveys, recitations, laboratories, or upper-level courses focused on specific themes or topics.
High School Chemistry & Physics Teacher Catholic Schools in the Archdiocese of New YorkHigh School Chemistry & Physics TeacherNew York, NYLocated in the East Village neighborhood of New York City, La Salle Academy is a small school with a 177 year history that enrolls a culturally diverse student population. La Salle Academy, an all-male college preparatory high school, seeks an experienced teacher.
High School Chemistry & Physics Teacher Archdiocese Of New YorkHigh School Chemistry & Physics TeacherNew York, NYLocated in the East Village neighborhood of New York City, La Salle Academy is a small school with a 177 year history that enrolls a culturally diverse student population. La Salle Academy, an all-male college preparatory high school, seeks an experienced teacher.
NewAdjunct Professor of Physics---Metro-2026 Fairleigh Dickinson UniversityAdjunct Professor of Physics---Metro-2026Teaneck, NJ$900–$1,000Job Title: Adjunct Professor of Physics---Metro-2026 Campus: Metropolitan Campus, Teaneck, NJ Department: Department of Chemistry, Biochemistry, and Physics-Metro Hiring Manager: James Dougherty Hiring Manager Title: Chair, Department Biochemistry, Chemistry, and Physics College: Gregory H. Quality instruction includes, but is not limited to, arriving on time and prepared to engage students through evidence-based active learning pedagogies, and/or assisting students with data collection and analysis via thoughtful guidance and encouragement.
Bootcamp Instructor-Summer-Mathematics & Physics(PTECH) Vaughn College of Aeronautics and TechnologyBootcamp Instructor-Summer-Mathematics & Physics(PTECH)Flushing, New YorkThe PTECH Summer Bridge Instructor is responsible for the coordination, planning, preparation, presentation, and evaluation of summer instruction designed to support incoming PTECH students before the start of the fall semester. The instructor will create an engaging and supportive learning environment that promotes academic confidence, critical thinking, and college readiness skills for students entering the PTECH program.
Part-Time Science Tutor (Chemistry/Physics) Tutor DoctorPart-Time Science Tutor (Chemistry/Physics)Ridgewood, New JerseyWe are currently seeking dynamic and experienced physics and chemistry tutors to provide in-home tutoring services to high school and college students in Ridgewood and the surrounding areas. Tutor Doctor of North Jersey is a renowned private tutoring company serving Northwest Bergen County and surrounding areas for over 15 years.
Bootcamp Instructor-Summer-Mathematics & Physics(PTECH) (NY, Flushing) Vaughn CollegeBootcamp Instructor-Summer-Mathematics & Physics(PTECH) (NY, Flushing)Flushing, NYThe PTECH Summer Bridge Instructor is responsible for the coordination, planning, preparation, presentation, and evaluation of summer instruction designed to support incoming PTECH students before the start of the fall semester. The instructor will create an engaging and supportive learning environment that promotes academic confidence, critical thinking, and college readiness skills for students entering the PTECH program.
Physics Instructor Center Education GroupPhysics InstructorBrooklyn, NY$45 / hourFull time faculty members may teach up to 24 platform hours each week (no more than 3 preps) and perform administrative duties in the areas of Student Success, Student Persistence, Faculty Development, Externship Coordination or other areas as designated by Program chairs, Director of Education and Campus Directors to meet full time requirements. The faculty member must possess a conferred graduate degree in field, or a graduate degree with 18 semester credits in field from a regionally accredited university for any State Common Course numbered class assignment.
High School Teacher, AP Physics Success Academy Charter SchoolsHigh School Teacher, AP PhysicsBrooklyn, New YorkRunning a large, fast-growing, and high-performing network of public charter schools takes a village - families, children, teachers, staff and faculty, advocates, and supporters alike. At Success Academy, we invest boldly in our teachers through exceptional pay growth, comprehensive health and wellness benefits, and career pathways that enable you to advance into leadership within an average of three years!
Instructor of Physics and Physical Sciences (Tenure Track) - Westchester Community College SUNY Westchester Community CollegeInstructor of Physics and Physical Sciences (Tenure Track) - Westchester Community CollegeValhalla, NYInstructor of Physics and Physical Sciences (Tenure Track) - Westchester Community College - SUNY Westchester Community College.
Adjunct Opportunities - Physics BERGEN COMMUNITY COLLEGEAdjunct Opportunities - PhysicsParamus, NJPhysical Sciences Department: The department of physical sciences at Bergen Community College serves the scientific interests of students through excellence in course offerings and effective teaching techniques to communicate scientific knowledge that meets student needs for today and paves the way to tomorrow. Application of scientific knowledge is encouraged to support the professional development of science majors and to enable non-science majors to make informed decisions based on scientific fact, leading to better educated citizens and consumers, as well as instilling a desire for life-long learning.
Assistant/Associate Professor 10 Months, Department of Chemistry and Physics, Fall 2026 Kean UniversityAssistant/Associate Professor 10 Months, Department of Chemistry and Physics, Fall 2026Union, New JerseyIts six colleges – the College of Business and Public Management; the College of Education; the College of Liberal Arts; the Dorothy and George Hennings College of Science, Mathematics and Technology; Michael Graves College; and the College of Health Professions and Human Services - offer more than 50 undergraduate programs and more than 70 options for graduate study, leading to master’s degrees, doctoral degrees, professional diplomas or certifications. Employment at Kean requires working at any of our New Jersey campus locations or affiliated work sites, which may include, but not be limited to: the main campus in Union; Kean Ocean in Toms River; Kean Skylands in Jefferson Township; Kean Jersey City; Kean at Brookdale in Middletown Township; Manahawkin; Princeton; and Trenton.
Physics Teacher 2026-2027 School Year NORTH HUNTERDON-VOORHEES REGIONAL HIGH SCHOOL DISTRICTPhysics Teacher 2026-2027 School YearFlemington, NJ$70,480–$104,735 / yearSalary Range: $70,480 - $104,735 (2026-2027 School Year) as per the Association Agreements with the Board of Education. Required criminal history background check and proof of U.S. citizenship or legal resident alien status.
Adjunct Faculty, Department of Chemistry and Physics Kean UniversityAdjunct Faculty, Department of Chemistry and PhysicsUnion, New JerseyEmployment at Kean requires working at any of our New Jersey campus locations or affiliated work sites, which may include, but not be limited to: the main campus in Union; Kean Ocean in Toms River; Kean Skylands in Jefferson Township; Kean Jersey City; Kean at Brookdale in Middletown Township; Manahawkin; Princeton; and Trenton. Its six colleges – the College of Business and Public Management; the College of Education; the College of Liberal Arts; the Dorothy and George Hennings College of Science, Mathematics and Technology; Michael Graves College; and the College of Health Professions and Human Services - offer more than 50 undergraduate degrees over a full range of academic subjects.
26-27 SY Teaching Jobs: Chemistry, Physics Kreyco26-27 SY Teaching Jobs: Chemistry, PhysicsNewton, New JerseyTo prepare for these opportunities, we are searching for candidates interested in teaching Chemistry and/or physics for middle and high school level students . Kreyco (formerly known as Language Learning Network) is a nationwide organization that specializes in preK-12 education.
High School Physics Teacher Forte Preparatory Academy Charter SchoolHigh School Physics TeacherNY$65,000–$95,000 / yearWho We Are: Forte Prep Academy High School is a new 9th through 12th grade college preparatory, tuition-free public charter school for Queens, New York, with a focus on serving the Jackson Heights, Elmhurst and Corona communities. It will also be a new home for events and sports for our greater community - we aim to open our gymnasium and rooftop athletic field to local classes and events, grounding the new Forte Prep High School as a true community partner in our neighborhood.
Sr Health Physicist Republic Services IncSr Health PhysicistNYRemote$109,500–$164,300 / yearServes as the technical point of contact for site health physics matters including radiological modeling, dose assessments, radiological safety and risk, site characterization, field instrumentation, radiological data review and validation, and radiation measurements. Familiarity with radiation simulation codes such as Gold Sim, RESRAD, MCNP, Micro Shield, CAP88 etc. to design shielding, calculate detector efficiencies, estimate radiological dose, and to perform site performance assessments etc.
Physicist - Radiation Oncology, Cancer Center (Staten Island) New York University School of MedicinePhysicist - Radiation Oncology, Cancer Center (Staten Island)Staten Island, NY$233,000–$280,000 / yearStrong oral and written communication skills • Excellent planning, organizational, and mathematical abilities • Demonstrated analytical and problem-solving skills with sound judgment and initiative • Ability to work independently within a collaborative clinical environment. Position Summary: Responsible for maintenance of quality assurance program, supervision and review of dosimetrists tasks, review of planning procedures and oversight of the patient planning and treatment process with brachytherapy or external beam radiation therapy.
Clinical Radiotherapy Physicist I Memorial Sloan Kettering Cancer CenterClinical Radiotherapy Physicist INew York, New YorkThis is an excellent opportunity to contribute to a large, high-performing clinical physics program supporting ~30 linear accelerators and 20 simulation suites across 8 regional sites, while specializing in commissioning, quality assurance (QA), and advanced dosimetry. Informed by basic research done at our Sloan Kettering Institute, scientists across MSK collaborate to conduct innovative translational and clinical research that is driving a revolution in our understanding of cancer as a disease and improving the ability to prevent, diagnose, and treat it.
Physicist – Radiation Oncology - Full Time NYPPhysicist – Radiation Oncology - Full TimeNew York, NY$233,000–$279,600 / yearNewYork-Presbyterian Hospital/Weill Cornell Medical Center is seeking a skilled medical physicist to join the physics group of an expanding department of Radiation Oncology in a patient-focused, high-tech environment offering leading edge treatments including a newly installed Icon Gamma Knife, MR-guided treatments, OSMS, ExacTrac, INTRABEAM IORT, TBI, HDR treatments and LDR implants. NewYork-Presbyterian Hospital is one of the nation’s most comprehensive academic health care delivery systems, dedicated to providing the highest quality, most compassionate care to patients in the New York metropolitan area and throughout the globe.
Physicist - Radiation Oncology - Full Time NewYork-PresbyterianPhysicist - Radiation Oncology - Full TimeNY$233,000–$279,600 / yearNewYork-Presbyterian Hospital/Weill Cornell Medical Center is seeking a skilled medical physicist to join the physics group of an expanding department of Radiation Oncology in a patient-focused, high-tech environment offering leading edge treatments including a newly installed Icon Gamma Knife, MR-guided treatments, OSMS, ExacTrac, INTRABEAM IORT, TBI, HDR treatments and LDR implants. 2024 "Great Place To Work Certified" 2024 "America's Best Large Employers" - Forbes 2024 "Best Places to Work in IT" - Computerworld 2023 "Best Employers for Women" - Forbes 2023 "Workplace Well-being Platinum Winner" - Aetna 2023 "America's Best-In-State Employers" - Forbes "Silver HCM Excellence Award for Learning & Development" - Brandon Hall Group.
Physicist - Manhattan, Cancer Center (Radiation Oncology) NYU Langone HealthPhysicist - Manhattan, Cancer Center (Radiation Oncology)New York, NY$222,017.06–$246,750Full timeResponsible for maintenance of quality assurance program, supervision and review of dosimetrists tasks, review of planning procedures and oversight of the patient planning and treatment process with brachytherapy or external beam radiation therapy. has ranked NYU Langone the No. 1 comprehensive academic medical center in the country for three years in a row, and U.S. News & World Report recently placed nine of its clinical specialties among the top five in the nation.
Physicist - Manhattan, Cancer Center (Radiation Oncology) New York University School of MedicinePhysicist - Manhattan, Cancer Center (Radiation Oncology)NY$222,017.06–$246,750 / yearResponsible for maintenance of quality assurance program, supervision and review of dosimetrists tasks, review of planning procedures and oversight of the patient planning and treatment process with brachytherapy or external beam radiation therapy. has ranked NYU Langone the No. 1 comprehensive academic medical center in the country for three years in a row, and U.S. News & World Report recently placed nine of its clinical specialties among the top five in the nation.
Divertor Plasma Physicist (Scientist/Sr. Scientist/Manager) Thea EnergyDivertor Plasma Physicist (Scientist/Sr. Scientist/Manager)Kearny, New JerseyWe may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses and identifying potential inconsistencies or verification signals in application materials based on available information. The ideal candidate will possess a strong background in plasma physics, particularly plasma edge physics, plasma-material interaction, and optimization along with hands-on experience in experiments and analysis.
Computational Plasma Physicist Thea EnergyComputational Plasma PhysicistKearny, New JerseyThe company is reinventing the stellarator using computer-controlled arrays of planar coils thereby replacing the intricate, complex modular magnets required in all other stellarator architectures. Position Overview: We are seeking highly motivated Computational Plasma Physicists to join our team, focusing on stellarator and fusion plasma physics simulations.
Computational Plasma Physicist – Transport Modeling Thea EnergyComputational Plasma Physicist – Transport ModelingKearny, New JerseyThe company is reinventing the stellarator using computer-controlled arrays of planar coils thereby replacing the intricate, complex modular magnets required in all other stellarator architectures. About Thea Energy: Thea Energy is leveraging recent breakthroughs in stellarator physics and engineering to create a faster and simpler approach to commercializing fusion energy.