Thor's Mjolnir hammer or Captain America's shield? Hint: The answer has to do with the conservation of energy — and the sonoluminescence of vibranium. Dr. Kakalios breaks down the physics behind ...

This is presumably a fore runner of the coin and feather demonstration. Millikan and Gale "A First Course in Physics" Revised Edition, 1913, page 89: That the air resistance is indeed the chief factor ...