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Faced with less-than-coherent federal policy, some states are taking independent approaches to the question of illegal immigration. Mark K. Matthews of stateline.org gives Melissa Block a state-by-state rundown.

After 61 days of traveling across Arctic ice on skis, Mike Horn and Borge Ousland complete their unassisted trek to the North Pole — and become the first explorers to do so in winter, during complete darkness. They traveled 620 miles, reaching the North Pole on March 23.

Sen. Arlen Specter (R-PA) is at work on legislation covering a temporary-worker program and giving undocumented immigrants a chance to become legal. And Sen. Bill Frist (R-TN) has alternative plans if Specter's effort fails.

Tens of thousands of demonstrators take to the streets of Los Angeles to protest legislation that would crack down on illegal immigration. The measure has already passed the House of Representatives. The Senate begins debate this week.

Angry over a bill that would crack down on illegal immigrants, marchers support a rival measure that would give legal status to most undocumented immigrants. They're getting a big push from Spanish-language media.

China's President Hu Jintao visits with President Bush. The two presidents discussed a wide range of issues, but made no major announcements. Hu wraps up his trip to the U.S. with a visit to Yale University in Connecticut.

More than 5 billion tons of carbon dioxide enter the U.S. atmosphere each year. Scientists in Baltimore are studying whether backyards help absorb carbon dioxide, and by so doing, slow the pace of climate change.

A cease-fire has been in place for years, but Armenian and Azerbaijani soldiers kill each other every week in the disputed region of Nagorno-Karabakh. The United States, Russia and France have been trying to negotiate a settlement.

The Centers for Disease Control and Prevention says Researchers have identified clusters of genes that appear to be linked to the tiredness and lack of energy associated with Chronic Fatigue Syndrome. The findings, announced by the Centers for Disease Control and Prevention, could lead to a better understanding of the condition.

The Bering Sea may be ice-free in 50 years. If that happens, what happens to its walrus population? Alaska Public Radio's Annie Feidt reports that U.S. and Russian scientists are gathering data to help protect the marine mammals.