Gentle giants of the Cambrian

During the Cambrian period, over 500 million years ago, there was an explosion of animal life. The top predators of the Cambrian were from a group called the anomalocarids, the largest animals of their day. But now, a new fossil discovery suggests that not all the anomalocarids were the fearsome killing machines scientists once thought. At least one, it seems, evolved into a gentle giant.
Read the research paper: A suspension feeding anomalocarid from the early Cambrian.

Tissue engineering: How to build a heart

With thousands of people in need of heart transplants, researchers are trying to grow new organs.