What are debris flows?: These fast-moving slurries of floodwater and sediment can hurtle down slopes, carrying cars, trees ...

Some say the reason most manhole covers are round is that a circle cannot fall through a smaller circular hole. Which of ...

Last time I wrote about new data that overturns the standard cosmological model. Before anyone starts dusting off their ...

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 ...