News
-
New World Stopover: People may have entered the Americas in stages
People first reached the edge of the Americas about 40,000 years ago but had to stay put for at least 20,000 years before melting ice sheets allowed them to move south and settle the rest of the continent.
- Earth
Don’t like it hot
King penguins don't live on continental Antarctica but even they are vulnerable to warming water.
-
Swell, a Pain Lesson: Gut microbes needed for immune development
Intestinal bacteria train the immune system to cause pain and swelling, but that's a good thing.
- Astronomy
Where stars are born
Some 300 young stars, hidden in visible light, shine through the dust in a new infrared portrait of the main cloud of a nearby star-forming region called Rho Ophiuchi.
