1. Intel International Science and Engineering Fair (Intel ISEF)
2. Google Science Fair
3. National Geographic GeoBee
4. FIRST Robotics Competition
5. Breakthrough Junior Challenge
6. Siemens Competition in Math, Science, and Technology
7. Regeneron Science Talent Search
8. National History Day Contest
9. Broadcom MASTERS (Math, Applied Science, Technology, and Engineering for Rising Stars)
10. MathCounts Competition US National Chemistry Olympiad
11. International Mathematics Olympiad
12. National Economics Challenge
13. Google Code Jam
14. American Mathematics Competitions (AMC)
15. American Invitational Mathematics Examination (AIME)
16. Science Olympiad
17. National Science Bowl
18. VEX Robotics Competition
19. National Spelling Bee

These are just a few examples of the many contests and competitions available for students. Participating in these events not only allows students to showcase their knowledge and skills but also provides valuable experiences and opportunities for personal and academic growth. It is important for students to be aware of such contests and competitions and take advantage of the chance to challenge themselves and excel in their areas of interest.