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The government keeps track of who is alive and who is dead. But there can be errors. And when you're mistakenly ruled dead, it can be remarkably tough to convince people you're still among the living.

Women encounter a dilemma when they get pregnant: Should they continue taking medications that keep them healthy? That question can be scary, because drugs are rarely tested for safety in pregnancy.

After months of negative news, Rio ushers in the Summer Olympics on Friday night. And the city finally gets to do what it's famous for: putting on a grand spectacle.

Moon Express Inc. has been given a green light to send a robot off the planet, aiming for the moon. It's a milestone in the effort to privatize space exploration.

Since 1979, the federal government has urged daily flossing. But the recommendation was recently removed from U.S. dietary guidelines after health advisers found the evidence of benefits to be weak.

Ornate refreshment kiosks were once the heart of Lisbon's parks and plazas. They faded away under a dictatorship that discouraged public gatherings. Now they're back to help revitalize the city.

Officials say they've found the first indication that mosquitoes are transmitting Zika virus in the U.S. Four people in South Florida are infected; travel or sexual transmission has been ruled out.

This weekend's top arts events include everything from (fake) blood and sequins to local art and post-punk.

Health officials put blood donations in South Florida on pause until it's known whether four cases of Zika virus were caused by mosquitoes in the U.S., or until blood donations can be screened.

Dolly, the first cloned mammal, had early arthritis and died young, raising concerns that clones age prematurely. But a study confirms the sheep's four sister clones are healthy and aging well.