How does elasticity work? How can something stretch and then come

Ex: Find the Force Required to Stretch a Spring (Integration App

Why do most fitted sheets on the market now have the elastic sewn all the way around? They fit so much more nicely when just the corners have elastic. - Quora

3 Ways to Stretch New Shoes - wikiHow

P5 G) Elasticity – AQA Combined Science Trilogy - Elevise

How Stretch Film Works With Stretch Wrappers

Team creates elastic materials that gleam when stretched

How would elasticity work in real life scientifically? - Quora

What is the most elastic material in the world? - Quora

Reduce Self-Loosening with Increased Elasticity