Nov. 28, 2009- Bacteria don't have easy lives. In addition to mammalian immune systems that besiege the bugs, they have natural enemies called bacteriophages, viruses that kill half the bacteria on Earth every two days.

Hammerhead sharks are some of the Ocean's most distinctive residents. "Everyone wants to understand why they have this strange head shape," says Michelle McComb from Florida Atlantic University. One possible reason is the shark's vision.

The Leonid Meteor shower is back once again! The Leonids are an easily observed and frequent meteor shower. On November 16th and 17th 2009, the display is predicted to be exceptional at many locations. The Leonid Meteors appear to radiate from the constel

Idaho is the most spammed state in the country, with a 93.8 percent rate of spam in its e-mail stream, according to security firm Symantec's Message Labs Intelligence.

An infant chimpanzee seized in Africa for the US Air Force in the 1950s, Marty was recruited into the military's air and space research program, paving the way for America's first manned spaceflight in 1961 and, ultimately, the Apollo 11 moon landing.

Eclipse of the Sun for July 22, 2009 (animated) will be visible across south-east Asia and the western Pacific. This will be a spectacular total eclipse, lasting over 6½ minutes at maximum and visible to millions.

In the year 1810, the country of Argentina, along with neighboring Bolivia, Paraguay and Uruguay, were controlled by Spain through the Viceroyalty of the Río de la Plata.

Megacities - Mexico City Part 1 (National Geographic Channel) To Mother Nature, Mexico City is one big target. On one side: one of the world's most earthquake-prone hotspots. On the other: one of the world's most active volcanoes.

The subway of Mexico City can survive any earthquake, watch why....

The BBC goes behind the scenes at the Internet Watch Foundation to see how its researchers cope with the psychologically demanding job of policing sites peddling images of child abuse.