The Google Science Fair is an annual contest that runs from February to May, open to anyone ages 13-18. The site displays winning entries from previous years, which are interesting to read about. The broad topics are

● Flora & Fauna
● Food Science
● Earth & Environmental Sciences
● Inventions & Innovation
● Electricity & Electronics
● Robotics
● Biology
● Chemistry
● Physics
● Behavioral & Social Sciences
● Energy & Space
● Astrophysics
● Computer Science
● Math

There is a springboard that suggests topics to work on based on a student's interests and aptitudes. The rules are here.