It demonstrates barometric pressure effects. The higher the pressure, the reduced buoyancy of the air in the packet.

It make a nifty “magic” trick if they don’t see you squeezing the bottle.

I grew the same type of plant in a box and 1 was exposed to a black light, 1 was exposed to a ‘growth’ light, 1 was exposed to a regular lightblub, and the control was outside in sunlight. then I measured their height and made a graph of it.

I didn’t win, but I got a ribbon.

Is there a difference between male and female resting blood pressure? Then – Does listening to (fill in the blank) music raise or lower your resting blood pressure.

Then just get one of those portable blood pressure monitors.

http://www.stuffintheair.com/kids-science-projects.html

I’m not so sure Wal-Mart is a normal store, though.

In the oven for about 15-20 minutes, but I’d take it out after 10 or 15. I’ve never tried it before, good luck.