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These mimic activities are about memory. To do them well, you need to remember exactly what you saw. Your brain makes memories in a few stages. Sensory memory describes what happens when you briefly see an object. It lasts just a split second, however.

It looks something like beef. It tastes something like beef. It’s made from cow cells, but no animal will die in the making of this beef patty. Biologist Mark Post, from Maastricht University in the Netherlands, plans to eat a lab‑engineered beef burger while appearing on television later this year.