Mr. Wizard's World

Earth Circumference, Bucket Magnifier, Square, Bottled Balloon, How Much Skin, Lightning and more (4x6)

Yayınlanma tarihi: Haz 10, 1987

Earth's Circumference, Lightning, and more. Mr. Wizard does a demonstration with Giselle using a large, round wooden tabletop and they note the measurements of the shadows cast by lengths of straws on the perimeter of the circle.