Playful S.T.E.A.M. Ideas | Dr. Amanda Sullivan, Ph.D. on Instagram: "A thaumatrope is the perfect way to combine arts, crafts, and science! Thaumatropes are optical toys that were popular in the 19th century. They have a picture on each side of a disk or card. When twirled quickly, the two pictures appear to blend into one due to the persistence of vision. "The persistence of vision" refers to the fact that even after an object is removed, the impression of an object seen by the eye remains on t

Thomas Hunter on History of Nuclear Weapons