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Is the Y chromosome dying out?

The Y chromosome may be in trouble. The sex we’re assigned at birth depends largely on a genetic flip of the coin: X or Y? Two X chromosomes and you (almost always) develop ovaries. An X and a Y chromosome?…

How long is a galactic year?

In one galactic year, also known as a cosmic year, the sun orbits the Milky Way. Humans are used to keeping time by measuring Earth’s movement relative to the sun. But while Earth’s trips around its star are noteworthy to…