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a deer tick

TOUGH BITE Deer ticks are now spreading a new species of bacteria that causes Lyme disease.

man with guns

BUYBACK  In 1996, Australia initiated a program to purchase and destroy certain types of long guns, including semiautomatic weapons.  Over the next four years, the country collected more than 650,000 guns. 

mouse nerve cell stimulation

MISS MATCH  After paw stimulation, nerve cells in the brain of a 7-day-old mice become active (top row, left), but blood doesn’t show up (bottom row, left). A 13-day-old mouse has larger nerve cell responses (top row, middle), but still no blood — that doesn’t appear until adulthood (bottom row, right). Red signals higher nerve cell activity and blood flow. 

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