Nature Example
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Stretchy and Squashy Science
Some materials are great because they can change shape and then go back to how they were.
The Inventors:
- Charles Macintosh used a "squashy" layer of rubber between cloth to make the first waterproof coats.
- John Dunlop used "stretchy" rubber filled with air to create the first comfortable bike tyres.
💡 Fun Facts
- Rubber originally comes from the "latex" sap of a tropical tree!
- If a material stays "bent" after you move it, it is called "malleable." Many metals are malleable when they are hot.
- John McAdam found that using small, jagged rocks that "interlock" made a road surface that wouldn't "squash" or sink into the mud.