genetic hitchhiking linked nearby variants recombination

A helpful gene can pull nearby genes along with it

When natural selection makes a useful gene variant more common, nearby DNA can become more common too simply because it sits close to that gene on the same chromosome. Even neutral or slightly harmful variants can sometimes be carried along this way.

A fixed exchange rate can give another country influence over your interest rates

To keep its currency tied to another currency, a central bank often has to move interest rates in the same direction as the country it follows. The fixed exchange rate can make prices and currency values more stable, but it also reduces freedom to set an independent monetary policy.

Ancient Egyptians used iron from meteorites thousands of years before the Iron Age

≈3200 BC

Nine iron-and-nickel beads found in Egyptian graves date to about 3200 BC, thousands of years before the Iron Age. The metal probably came from meteorites and was shaped by repeated heating and hammering. People could work iron long before they learned to make it from ore on a large scale.

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genetic hitchhiking linked nearby variants recombination

A helpful gene can pull nearby genes along with it

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