News
- Health & Medicine
Operation overload: Kids’ backpacks
Sixth-graders in Italy routinely carry school backpacks that equal, on average, 22 percent of their body weight, a finding researchers link to an earlier report that more than 60 percent of children in this age group had experienced low-back pain more than once.
- Physics
Computers Crunch Quantum Collisions
Physicists have mathematically described what happens when an electron collides with a hydrogen atom, accomplishing a longstanding goal.
- Earth
Smoggy Asian air enters United States
High concentrations of ozone from Asia reach the United States.
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Mom’s eggs execute Dad’s mitochondria
Sperm may tag their own mitochondria for destruction inside the fertilized egg.
