A Head for Numbers
Everybody has one--even rats and pigeons, to say nothing of people. The ability to grasp small numbers and map them onto a number line in the brain is an evolutionary birthright of ours. Arithmetic, of course, is another matter.
by Robert Kunzig
Heaven's New Fires
Only a few years ago meteorologists thought that during a thunderstorm all the action was below the clouds. Now, to their delight, they've realized they were spectacularly wrong.
Mysteries of the Heart
No one knows why a puzzling growth sometimes chokes off the blood vessels that embrace the heart, or who is most susceptible to it. But a seemingly harmless--and nearly ubiquitous--virus may provide a valuable clue.