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What are the political ramifications of the California Supreme Court's ruling upholding the ban on same-sex marriage? And will the U.S. Supreme Court soon have its first Hispanic justice? We'll get analysis on these two important legal issues.

Finding out what single entity produces the most greenhouse gases in the United States is difficult, it turns out. But the government knows which power plant emits the most carbon dioxide.

Robert Siegel talks with John Emsley, author of The Elements of Murder: A History of Poison, about the poisoning of Russian-spy-turned-Kremlin-critic Alexander Litvinenko. Litvinenko died last Thursday after being poisoned with radioactive Polonium-210.

The Prestige

Melissa Block reports from Gulfport, Miss., on the devastation caused by Hurricane Katrina and on the efforts to help those whose homes have been destroyed.

Thursday's bombings in London came as the Group of Eight industrialized nations began its annual meeting. The G8 leaders agreed Friday to increase aid to Africa by $50 billion. That increase will take place by 2010, and is a doubling of foreign aid for some countries, including the United States.