When is the big daylight saving time (often called daylight savings time) switchover in autumn 2009? Why do we fall back in the first place?

Australia's iconic, island-like Uluru, or Ayers Rock, may soon be off limits to climbers, mainly because Aborigines see the desert sandstone formation as sacred. Video.

Highway bridges, an 80s public library, and a concrete powerboat arena are just some of the U.S. structures named on the World Monument Fund's 2010 Watch List of landmarks worth preserving.

Today's announcement that U.S. swine flu deaths among children are "shooting up" is generating headlines. Meanwhile swine flu is infecting another group up to five times more often than the general public, advocates say.

The inescapable bar code celebrates its 57th anniversary Wednesday, with a little help from Google. Find out how it came to be, why it's still with us, and what's next.

See Bluestonehenge, the newly discovered site that archaeologists say was likely a key stop on the journey to the afterworld—and to Stonehenge itself—for many Stone Age Britons.

The newfound "Bluestonehenge" stone circle may have been a ritual pit stop on the road to Stonehenge—and the afterlife.

People around the world are celebrating Mohandas K. Gandhi's 140th birthday, including children who dressed as him (mustache and all), U.S. President Barack Obama—even Google.

Whole villages have been wiped out and scores are dead after an earthquake in the South Pacific triggered a tsunami that swept across several islands, including American Samoa, which has now been declared a major disaster area.

Found by an amateur treasure hunter in England, the largest known Anglo-Saxon gold hoard is rich with precious stones and intricately wrought war gear.

Found by an amateur treasure hunter in England, the largest known Anglo-Saxon gold hoard is rich with precious stones and intricately wrought war gear.

Found by an amateur treasure hunter in England, the largest known Anglo-Saxon gold hoard is rich with precious stones and intricately wrought war gear.

See Ohio daredevils stage their own Burning Man festival, a planet take shape, whiskers go wild, and more in the week's best news pictures.

It turns out you can build Rome in a day, according to researchers using a new computer program that analyzes pictures posted online to rapidly reconstruct cities in 3-D.

Will day and night really be equally long on September 22, 2009, the autumnal equinox (or fall equinox)? Get the answer—and other first-day-of-fall facts.