PBS
Wgbh: Peep and the Big Wide World: Explore and Play: Toy Sleds
Students experiment with different materials and objects to make a sled that will slide down the ramps.
National High Magnetic Field Laboratory
Magnet Academy: Maglev Trains
Prof. Eric Hellstrom of the lab's Applied Superconductivity Center uses a toy train to demonstrate magnetic levitation, the Meissner Effect and magnetic flux trapping. [6:30]