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All five living presidents were together in Dallas, Texas, Thursday, for the opening of the George W. Bush presidential library and museum. The new $250 million library is on the campus of Southern Methodist University.

Nearly 10,000 mourners jammed the basketball arena on the campus of Baylor University to honor the men who died fighting a fertilizer fire last week. At least 14 people died in the explosion in the little town of West just north of Waco.

Dzhokhar Tsarnaev is now being held at a federal facility outside Boston where he can be treated for his injuries. Some victims of the Boston Marathon bombings, and their families, had been upset that he was in the same hospital as people who had been injured by the blasts.

Bill Clinton posted a few messages, including one saying he's enjoying Twitter so far. Earlier, TV host Stephen Colbert had made the former president a fake Twitter account.

The cause of the blaze at a facility near Moscow is under investigation. Police tell Russian media that most of the estimated 38 victims likely had been under sedation and died in their sleep. Only three people are reported to have survived. A nurse was able to lead two patients to safety.

Boston Beer Company has sponsored the marathon for years — even brewing a special beer for the event: 26.2 Brew. The company says it's going to donate all 2013 proceeds of that beer to a local charity that helps families touched by the tragedy.

The death toll in the collapse hovers around 300, but rescue workers hope some of the hundreds more buried in the rubble can be taken out alive.

Parts of Utah's Great Salt Lake are 10 times saltier than the ocean. But the lake is host to plenty of life, including salt-loving microbes that can turn the lake's water bubblegum pink. Bonnie Baxter, director of the Great Salt Lake, discusses how the bugs might hold the secrets to better sunscreen, hydrogen fuel cells--even life on Mars.

Federal election law gives married couples some advantages in making political contributions. The Federal Election Commission this week tried to make those same breaks available to couples in same-sex marriages — but commissioners said they're thwarted by the federal Defense of Marriage Act.

An oversight committee halted a big clinical study of an experimental HIV vaccine after a peek at preliminary results showed there was no way the study would be able show the vaccine works. More vaccinated people became infected with HIV than those who got placebo shots.