Classic sell signal points to significant downside. Charles Dow identified the head & shoulders pattern 100 years ago. Valuations at levels beyond almost any fundamental defense. Nvidia’s daily chart ...

Biologists have spent generations trying to explain what controls the speed of life. You may already be familiar with the classic idea that growth rises with more nutrients and then steadies. The ...

Katie has a PhD in maths, specializing in the intersection of dynamical systems and number theory. She reports on topics from maths and history to society and animals. Katie has a PhD in maths, ...