Why do leeches have so many brains? // TRAIN BRAIN

Why do leeches have so many brains?

Attaching yourself onto bigger creatures and sucking their blood doesn't sound like a taxing lifestyle. But leeches need 32 brains to cope. We explain why #biology #science

The Economist

On Tuesdays and Thursdays, The Economist posts videos that give authoritative insight and opinion on international news, politics, business, finance, science, technology and the connections between them. We're also producing full films such as The Disrup...

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