News

Physics

Lose a memory, use energy

Lab experiment confirms link between erasing information and heat flow.

Space

Galactic smashup leaves dark matter debris

Find in ‘train wreck’ cluster forces astronomers to re-think theories about relationship between mysterious dark matter and galaxies.

Health & Medicine

Excess salt may stiffen heart vessels

As sodium in diet increases, a coronary risk factor independent of blood pressure escalates, according to a study in middle-aged U.S. men.

Life

Sawfish don’t saw

Spiked snouts whack prey to the bottom, helping the predator better get its mouth around dinner.