The extent of Canada's worst wildfire season on record continued to grow this week after a combination of extreme heat events, unusually dry weather and lightning strikes stoked hundreds of out of control wildfires across the country.
Scientists are beginning to understand how sex chromosomes and hormones affect people's risk for certain diseases — and whether the biology behind those differences can be harnessed to improve treatments.
El Niño conditions are only slowly gathering strength in the tropical Pacific Ocean, but the National Oceanic and Atmospheric Administration expects the event is likely to peak at a moderate to strong intensity by the fall and winter.
A region of space full of newly forming stars 390 light-years from Earth shines in a new photo from NASA's James Webb Space Telescope.
Why it matters: The young stars in this image are all similar in mass to our Sun, allowing scientists to peer into what the early history of our nearest star likely looked like.
Earth's 4.5 billion-year history is divided into geological epochs that each typically span millions of years. On Tuesday, scientists announced that sediment at the bottom of a lake in Ontario, Canada, contains key indicators that the world has entered a new epoch called the Anthropocene.
The big picture: These researchers say humans, rather than a natural phenomenon like an asteroid strike, pushed the planet into this phase — one in which Earth is being rapidly transformed.
