• I love those demonstrations using liquid nitrogen. It's fun to see how quickly it can freeze things and make them brittle. It is one of the most memorable science classes I recall from high school.
  • I would show the little muffins how dirty all their hands were by swabbing them and putting the swab on a slide...then showing them all the little creepies that were on their hands under a microscope. "Wash your hands, dingies!,..after 'everything' and before eating or even touching somebody else. These little buggies are what causes all of us to get sick when they get inside us".
  • honesty is the best policy
  • How life began on earth. :)
  • Something in physics. Possibly thermodynamics as it is often quoted but seldom understood.

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