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Wheel Invention: What Took So Long? (Huffington post)

By: Natalie Wolchover

Published: 03/06/2012 03:12 PM EST on Lifes Little Mysteries

Wheels are the archetype of a primitive, caveman-level technology. But in
fact, they're so ingenious that it took until 3500 B.C. for someone to invent
them. By that time — it was the Bronze Age — humans were already casting metal
alloys, constructing canals and sailboats, and even designing complex musical
instruments such as harps.

The tricky thing about the wheel is not conceiving of a cylinder rolling on
its edge. It's figuring out how to connect a stable, stationary platform to
that cylinder.

"The stroke of brilliance was the wheel-and-axle concept," said David Anthony,
a professor of anthropology at Hartwick College and author of "The Horse, the
Wheel, and Language" (Princeton, 2007). "But then making it was also
difficult."

To make a fixed axle with revolving wheels, Anthony explained, the ends of the
axle had to be nearly perfectly smooth and round, as did the holes in the
center of the wheels; otherwise, there would be too much friction for the
wheels to turn. Furthermore, the axles had to fit snugly inside the wheels'
holes, but not too snugly — they had to be free ...

Huffington post

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