Uncategorized
- Earth
A magnetic field reversal 42,000 years ago may have contributed to mass extinctions
The weakening of Earth's magnetic field beginning around 42,000 years ago correlates with a cascade of environmental crises, scientists say.
- Astronomy
The first black hole ever discovered is more massive than previously thought
New observations of Cygnus X-1 are leading astronomers to rethink what they know about stars that turn into black holes.
- Health & Medicine
The U.K. approved the world’s first COVID-19 human challenge trial
Dozens of young, healthy volunteers will be deliberately exposed to the coronavirus to find out how much virus it takes to get someone sick.
