We're all a certain number of years and months and days old, but alongside this chronological age is a biological age: the rate at which our bodies are wearing down.
Knowing how the body burns fat is crucial to understanding all kinds of metabolic systems - for regulating body temperature, weight, energy levels, and more - and researchers just discovered a new molecular 'dial' controlling fat burning in mice.
Two large gold deposits discovered in China may hold a collective mass of over 2,000 metric tons (2,200 US tons) of the precious material - the largest ever found within the country's borders.
The explosion of a reactor in the Chernobyl Nuclear Power Plant 40 years ago in April 1986 was one of the biggest human-made accidental disasters in history.
Oxygen levels have decreased in almost 80 percent of rivers worldwide, and they're going to continue losing this precious resource unless we make some serious changes.