Challenge

Challenge your friends! Choose your subject and participants.

Challenge - Light

Explore the phenomenon of light: its sources; reflection; light and colour; lasers; holograms.

Invite participants by entering their e-mail and name.

E-mail Name
Participant 2
Participant 3
Participant 4
Participant 5
Participant 6
Participant 7
Participant 8
Participant 9
Participant 10
No of questions 5 10 20 39
Message to the participants