Milk! It’s a cookie’s best friend. It’s a key part of a creamy cup of hot chocolate. And it’s delicious, whether it comes from a cow, a goat, an oat, or a coconut. But no matter where your milk comes from, one thing is probably the same – the whitish color. What’s up with that? We asked science writer Stuart Farrimond to help us find the answer.

Got a question MOO-ving through your brain? Send it to us at BrainsOn.org/contact, and we’ll milk the answer for all it’s worth!