Add Yahoo as a preferred source to see more of our stories on Google. Researchers say they've developed a urine test that could answer whether prostate cancer is aggressive and requiring immediate ...

(Viktor Gladkov/Canva Pro) If you're concerned that you act too aggressively at times, you might be able to regain your calm.

Chimpanzees have a reputation for being aggressive, while bonobos are often seen as their peaceful counterparts. This contrast has frequently been used to explain different sides of human nature.