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A follow-up test on cyclist Floyd Landis has also shown high levels of testosterone. The cycling team fired him and he may lose his Tour de France title, but he vows to fight to clear his name.

An international panel has unanimously recommended that Pluto retain its title as a planet, and it may be joined by other undersized objects that revolve around the sun.

Military investigators have found there is evidence supporting allegations that U.S. Marines killed unarmed civilians in the Iraqi town of Haditha last November, according to unnamed Pentagon sources. The investigation is ongoing and public results have not yet been announced.

Three U.S. soldiers have been charged with premeditated murder after being accused of shooting three detainees north of Baghdad on May 9 and then threatening to kill a fellow soldier if he told the truth about the incident.

Some of the hottest global weather in recorded history is happening this week. It's likely that records will continue to fall this year.

Warren Buffett's pledge of $31 billion to the Bill and Melinda Gates Foundation has been long in the making, according to friends of the astute investor from Nebraska. Fortune magazine's Carol J. Loomis says Buffett told her months ago about his plan.

In Mexico, millions will go to the polls on Sunday to elect a new president. In the second of our series on Mexico's presidential contenders, we profile conservative candidate Felipe Calderon. The latest numbers show he is slightly behind his left-leaning opponent.

An emotional House debate on the war in Iraq concludes with passage of a Republican-drafted resolution. In a 256-153 vote, 42 Democrats crossed party lines to approve a document that rejects a set date for withdrawing U.S. troops from the conflict.

Roberto Madrazo is the presidential candidate of the party that ruled Mexico for 71 years, the PRI. The fortunes of his party have tumbled since it lost the presidency in 2000 to President Vicente Fox. Madrazo is running a distant third in the polls for Sunday's election.

Chechen warlord Shamil Basayev died in Ingushetia when a dynamite-laden truck exploded in his convoy, according to Russian officials. Basayev was held responsible for a large number of terrorist attacks in Russia, including a 2004 school hostage taking that left 331 dead. The Wall Street Journal reporter Alan Cullison talks with Madeleine Brand about Basayev.