A hand pouring milk from a jar into a glass outside - Seksan Mongkhonkhamsao/Getty Images If you've ever stared into a glass of milk and wondered, "Why is this stuff so bright white?" you're asking a ...

Have you ever noticed how the milk section at your grocery store is actually quite colorful? How the rainbow of caps and labels contrasts with the white cartons? You may not even be aware of it, but ...