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    Race your toy car by pointing its light sensor to the sun. Instructors can use it to teach about solar panels.
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Race your toy car by pointing its light sensor to the sun. Instructors can use this toy to teach about solar panels.

The demo shows the implementation of a mobile quiz, that when answering correctly the phone's flash light is lit and acts as the sun. Therefore, the winner actually answered correctly and faster.

Created during a 24-hour MindCET Ed-Tech Makeathon 2015
Team: 
15-16 year-old makers
a Bezalel student
a few excited parents
one psychologist that works with Bedouin people (Desert natives).
One car is ready. It got rebuilt 2-3 more times before it became stable enough to go :)
Racing with 2 cars is a crucial part of the experience
The props to build one car
First tech working
First try outs in the real light (or dark, depends how you look at it)