You can tell the age of a whale by looking at the wax plug in its ear. This plug in the ear has a pattern of layers when cut lengthwise that scientists can count to estimate the age of the whale.

The first jigsaw puzzle was created by map maker John Splisbury who mounted one of his maps on a sheet of hardwood. He proceeded to cut around the borders of each country use a fine saw.

Scientists have discovered a way to make biodegradable plastic from plants by using genetic engineering.

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