Gut
bacteria can turn a nutrient in red meat into a chemical that increases
the risk of hardened arteries. The new finding helps explain why eating
lots of red meat might foster heart disease.
Air
pollution from cars and industries can spew pollutants known as PAHs. A
new study shows children have a greater risk of ADHD if their mothers
inhaled a lot of PAHs while pregnant.
Asteroids and comets that smashed into the planet billions of years
ago, as in this illustration, could have provided the necessary energy
to hot-wire life, new experiments suggest.