Despite their reputation, rats are surprisingly sociable and regularly help each other out. Researchers have shown that a rat just has to smell another rat that is engaged in helpful behavior to increase their own helpfulness. This is the first ...

How much information can you get from a speck of purple pigment, no bigger than the diameter of a hair, plucked from an Egyptian portrait that's nearly 2,000 years old? Plenty, according to a new study. Analysis of that speck ...