Kolkowitz pointed out this levitation effect would occur when any other spring or other elastic, nonrigid object is dropped -- and no object is completely rigid. "It's just that the Slinky is an ...

“It’s the combination of the Slinky pulling upward and gravity accelerating downward, and those two effects cancel each other out,” Vanderbei said. Both of these effects can be explained by ...

Betty James, who named the toy her husband invented -- the Slinky -- and rebuilt the toy company he abandoned, making the springy plaything a pervasive part of American culture, has died.