Why do egg whites turn white when you cook them?

When you crack open a raw egg, the egg white isn't white at all—it's more like a clear jelly. So why does it turn white when you cook it? Does that make it safe to eat? And what about egg yolks?

Test finds Chernobyl residue in Belarus milk

On the edge of Belarus' Chernobyl exclusion zone, down the road from the signs warning "Stop! Radiation," a dairy farmer offers his visitors a glass of freshly drawn milk. Associated Press reporters politely decline the drink ...

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