1.7-Billion-Year-Old Rocks Reveal the Secrets of Earth's First Complex Life!

Super-ancient fossils found in Australia show exactly where the very first complex cells [cells with a control center, just like the ones inside you and me] loved to hang out. These tiny creatures could only survive in places with plenty of fresh oxygen, while their simpler neighbors lived in the suffocating mud. Imagine what our world would look like today if these oxygen-loving pioneers had never started growing!