WEEK IN PHOTOS: Ugliest Dog, "Miracle" Birth, and More - Filipino inmates dance to "Thriller," a girl rests 1,400 feet in the air, and an elderly ape has a baby in this week's best news photos.

"Diamond Dust" Snow Falls Nightly on Mars - Ice crystals drifting from Martian clouds resemble the glittering precipitation that falls in Earth's Arctic regions during winter, new data show.

Tunguksa Blast Mystery Solved by Space Shuttle? - Rare "night shining" clouds linked to the 1908 Russian event and plumes from shuttle launches suggest that the blast was caused by an icy comet, a new study says.

July 4th Facts: Fireworks, Founding Fathers, and More - From artillery shows to hot dog eating, learn how Americans have celebrated the Fourth of July over the centuries.

PICTURES: World Wonders Added to UN Heritage List - The Tower of Hercules, a sacred mountain, and royal tombs are among the sites recognized for their universal value to humanity during a 2009 World Heritage Committee session.

Pacific Northwest Forests Could Store More Carbon, Help Address Greenhouse Issues - The forests of the Pacific Northwest hold significant potential to increase carbon storage and help mitigate greenhouse gas emissions in coming years, a recent study concludes, if they are managed primarily for that purpose through timber harvest reductions and increased rotation ages.

New Type Of El Nino Could Mean More Hurricanes Make Landfall - A new study, in the journal Science, suggests that the form of El Nino may be changing potentially causing not only a greater number of hurricanes than in average years, but also a greater chance of hurricanes making landfall.

How global warming shrank St Kilda's sheep - It was the curious case of the shrinking sheep. For nearly a quarter of a century the wild Soay sheep on the windswept Scottish island of Hirta have been getting smaller when evolution should have made them bigger.

New Sustainable Development Commission report - Low-carbon zones are one of the proposals for the 21st century's built environment set out in a new Sustainable Development Commission report.

Scheme fund switch urged - The government should reject road schemes from regional funding allocations in favour of low-carbon projects, the Campaign for Better Transport has said.