Create a program for a "robot" to find and dispose of "toxic waste" using a few simple commands and your imagination.
http://www.tryscience.org/experiments/experiments_robot_athome.html
Canti-what? A cantilever is a structure that sticks out way beyond its base. Try to build one.
http://pbskids.org/zoom/activities/sci/cantilever.html
Can you stand on paper cups without crushing them?
http://pbskids.org/zoom/activities/sci/columns.html
A straw bridge that's crazy
http://pbskids.org/zoom/activities/sci/crazystrawbridge.html
The sky's the limit. Build a tower as high as you can using only cups.
http://pbskids.org/zoom/activities/sci/cuptower.html
An edible edifice. Build a tower as high as you can using only marshmallows
http://pbskids.org/zoom/activities/sci/marshmallowtower.html
Can you make a paper bridge that can support 100 pennies?
http://pbskids.org/zoom/activities/sci/paperbridge.html
Can you stand on paper cups without crushing them?
http://pbskids.org/zoom/activities/sci/papercupwalk.html
Can just one cup hold your weight?
http://pbskids.org/zoom/activities/sci/papercupwalkii.html
Another tall thing to make
http://pbskids.org/zoom/activities/sci/papertower.html