Scientists have traced the origin of the modern horse to a lineage that emerged 4,200 years ago

WASHINGTON (AP) — The horse transformed human history – and now scientists have a clearer idea of when humans began to transform the horse.

Around 4,200 years ago, one particular lineage of horse quickly became dominant across Eurasia, suggesting that's when humans started to spread domesticated horses around the world, according to research published Thursday in the journal Nature.

There was something special about this horse: It had a genetic mutation that changed the shape of its back, likely making it easier to ride.

"In the past, you had many different lineages of horses," said Pablo Libr...


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