We had a bread bag blowing battle, tonight, following a suggestion from Eric Muller's While You're Waiting for the Food to Come: Experiments and Tricks That Can Be Done at a Restaurant, the Dining Room Table, or Wherever Food is Served.
As you might imagine, there was a science trick involved, to make it extra fun. But first, a word of warning: bread bags are terrible suffocation hazards, so do this only with adult supervision.
Standing back to back, I told the kids to blow up their bags, as fast as they could. But, I let T in on the secret. While, G was blowing the bag up, by holding it up to her mouth, like a balloon, T held his bag out from his face, and blew in the direction of the opening.
T, filled his bag much faster than G. Blowing into the bag from a distance, made a low pressure column of air, that drew the air around it, into the bag, too. Meanwhile, G was filling her bag slowly, using only the air from her lungs.
We also discovered, that bread bags make pretty good balloons for bopping around the backyard, when the science lesson is through.
It's great to be a homeschooler.