After examining dozens of Ice Age cave sites across Europe, paleo-archaeologist Genevieve von Petzinger found our ancestors used a small group of signs in common. Here, she walks us through her eye-opening discoveries and their implications.

Synthetic biologist Tal Danino manipulates microorganisms in his lab to create eye-catching, colorful patterns. Here’s a look at the process he uses to turn “Oh, yuck” into “Oh, wow.”