Smartivity bonus

Bonus activities

Three quick science tricks with things from home. Try them with anyone who loves building.

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1. 1

   Paper helicopter

   A grown-up cuts a strip of paper, splits the top into two wings and adds a paper clip at the bottom. Hold it as high as you can reach (no climbing) and let go: it spins as it falls.

2. 2

   Shadow size

   In a dark room, shine a flashlight at a toy in front of a wall. Move the toy closer to the light, then farther. When is the shadow biggest?

3. 3

   Paper bridge

   Lay a sheet of paper between two books. How many coins can it hold? Fold it like an accordion and try again.

Safety first: A grown-up does any cutting. Household things only.