This satellite image from Oct. 28 shows Hurricane Sandy in the Atlantic Ocean before making landfall. NASA via Getty Images hide caption

itoggle caption NASA via Getty Images

Brain scans using Amyvid dye to highlight beta-amyloid plaques in the brain. Clockwise from top left: a cognitively normal subject; an amyloid-positive patient with Alzheimer's disease; a patient with mild cognitive impairment who progressed to dementia during a study; and a patient with mild cognitive impairment. Slide courtesy of the journal Neurology hide caption

itoggle caption Slide courtesy of the journal Neurology

A person's DNA can say a lot about a person, but not why someone has committed a horrific crime like mass murder. iStockphoto.com hide caption

itoggle caption iStockphoto.com

A boy in Lima, Peru, receives a hepatitis B vaccine during an immunization drive in 2008. The United Nations is considering a ban on the preservative thimerosal, which is often used in hepatitis B and other vaccines in developing countries. Martin Mejia/AP hide caption

itoggle caption Martin Mejia/AP

A light micrograph image of telomeres, shown in yellow, at the end of human chromosomes. Women tend to have longer telomeres than men and tend to outlive men, according to new research matching genetic information with medical records. Peter Lansdorp/Visuals Unlimited/Corbis hide caption

itoggle caption Peter Lansdorp/Visuals Unlimited/Corbis

The Beatles rehearse for that night's Royal Variety Performance at the Prince of Wales Theatre in 1963. Central/Hulton Achive/Getty Images hide caption

itoggle caption Central/Hulton Achive/Getty Images

Residents of the Colonial Place neighborhood watch as heavy rain from Hurricane Sandy floods the Lafayette River in Norfolk, Va., on Oct. 28. Rich-Joseph Facun/Reuters/Landov hide caption

itoggle caption Rich-Joseph Facun/Reuters/Landov

Motorists drive through standing water at an intersection flooded from the remnants of Tropical Storm Ida in the Ocean View area of Norfolk, Va., in November 2009. Steve Helber/AP hide caption

itoggle caption Steve Helber/AP

These computer models from Oct. 26 of then-Hurricane Sandy show different predictions for the storm's path. NOAA hide caption

itoggle caption NOAA

In this satellite image provided Friday by the National Oceanic and Atmospheric Administration, Hurricane Sandy's huge cloud extent of up to 2,000 miles churns over the Bahamas, as a line of clouds associated with a powerful cold front approaches the East Coast of the U.S. Handout/Getty Images hide caption

itoggle caption Handout/Getty Images

A school of manini fish passes over a coral reef at Hanauma Bay in 2005, in Honolulu. Researchers say schooling behavior like the kind seen in fish helps groups of animals make better decisions than any one member of the group could. Donald Miralle/Getty Images hide caption

itoggle caption Donald Miralle/Getty Images