Seeing the invisible (Science Tricks)

Seeing the invisible (Science Tricks)

Brain Teasers & Science Tricks https://plus.google.com/u/0/communities/117193044016508804042 (Головоломки и занимательные эксперименты). Step by Step lessons. Enjoy a good brain teaser? Then you’ve come to the right place! Puzzles with matches, coins, paper, thread and the like await you! Solve the riddles yourself or challenge your friends. And there’s more here than just brain teasers. Do you…