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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.

Viruses are the cause of a number of diseases. The flu, chicken pox and most common colds are just a few examples of diseases caused by viral infections.