It's a one-dollar bridge!
http://pbskids.org/zoom/activities/sci/strawbridge.html
A skyscraper made of straws
http://pbskids.org/zoom/activities/sci/strawtower.html
Behold the Mighty Power of Paper
http://pbskids.org/zoom/activities/sci/strongestshape.html
Make Tiger Woods proud by building a tower that can hold a golf ball at the top, out of 10 pieces of newspaper and 50 centimeters of tape
http://pbskids.org/zoom/activities/sci/supergolftower.html
How many books can your bridge hold
http://pbskids.org/zoom/activities/sci/suspensionbridge.html
Build a skyscraper sturdy enough for a gorilla
http://pbskids.org/zoom/activities/sci/tallsturdybuilding.html
Make a balloon as hard-headed as you are.
http://pbskids.org/zoom/activities/sci/balloonbrain.html
Gravity - not just a good idea. It's the Law! Use the Law of Gravity to tell time.
http://pbskids.org/zoom/activities/sci/ballsandramp.html
A double-dipping machine that blows billions of bubbles.
http://pbskids.org/zoom/activities/sci/bubbleblowingmachine.html
Try out a tent made from tubes and tape.
http://pbskids.org/zoom/activities/sci/buildatent.html