Is the Earth Flat?

For this experiment you’ll need to take two measurements at least 250 km (a little more than 150 miles) due north or south of each other. You will make a couple of observations, take some measurements, use some math, and discover if the surface of the Earth is curved, and, if so, by how much. … More Is the Earth Flat?

“Cooking” a Comet

OK, we didn’t turn on a burner or nuke anything, but the ingredients did change temperature in my demonstration “Cooking a Comet.”  My first presentation was at Grimsley High School where we could throw the finished comet into the woods outside our classroom. The tail was beautiful as our dirty snowball completed its portion of … More “Cooking” a Comet