Some materials return to the shape they were after being stretched. We call these materials elastic, like rubber bands. You can change the shape of some materials like Plasticine. You can push it.

When the tension is removed, the stretched rubber band spontaneously snaps back to its original shape; that is D G is negative and -D G is positive. The cooling effect means that it is an endothermic ...

Egged on by adoring fans who demanded more aircraft videos, [ProjectAir] has decided to break the world record for rubber band powered aircraft… despite having never built a rubber band powered ...