What is hidden in 3D image?

Stereogram - 3D Image

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What stays in one corner bu...

Q: What stays in one corner but travels around the world?
A: A stamp.

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Leather tanning

In 1884, the first U.S. patents for tanning hides and skins through the action of a metallic salt were issued to Augustus Schultz of New York City. His invention of a chrome tanning process enabled leather to be tanned thinner and stronger than by vegetable tanning. (Nos. 291,784 and -5)

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