Did animal armor evolve before the Cambrian explosion

Some early animal shells may have been both armor and support

Even before the Cambrian explosion, some animals built hard mineral tubes. The tubes may have protected them from predators while also raising them above nearby competitors. Holes drilled into some fossils suggest that battles between predators and prey had already begun.

Elevators do not hang from a single cable

2–6 cables

Modern traction elevators typically use 2–6 support cables rather than one. Each cable can support the elevator’s rated load plus 25%, and high-rise elevators may use 12 or more.

Refugees carried manuscripts from Constantinople to Italy

After Constantinople fell, refugees carried thousands of Greek and Latin manuscripts to Italy, helping stimulate the Renaissance. Before the city's fall, Constantinople's libraries had preserved these works during periods when many similar writings were being destroyed in Western Europe and North Africa.

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Did animal armor evolve before the Cambrian explosion

Some early animal shells may have been both armor and support

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