Watch a simple but fascinating chemistry experiment using phenolphthalein and dry ice to demonstrate pH changes in real time. See how carbon dioxide forms acid in water and causes a dramatic color ...

Breakthroughs, discoveries, and DIY tips sent six days a week. Terms of Service and Privacy Policy. It’s not easy being green–or blue, or purple, or orange–at ...

Zebras, a children’s tale goes, became striped after “standing half in the shade and half out of it.” While the author, Rudyard Kipling, wasn’t a biologist, his story may hold some truth: research ...