News
- Space
Super-Earths may come in two flavors
As more exoplanets are discovered, evidence emerges that worlds can be either fluffy or dense.
- Humans
Fossil finds offer close look at a contested ancestor
Nearly 2 million-year-old fossils offer glimpses of a species that may, or may not, have been crucial for human evolution.
- Earth
Earthly riches heaven sent
A period of heavy meteorite bombardment after Earth's formation may have peppered Earth's outer layers with useful metals.
- Health & Medicine
Brain stents pose risks
Devices to prop open narrowed vessels appear to raise the risk of death or stroke compared with medicines alone, a study finds.
