The challenges show religion is "on the minds of many people," says Deborah Caldwell Stone of the American Library Association. Another reason people objected to books was explicit sexual content.
The White House hasn't announced any such plans. But Obama will be in Japan next month and a visit would be a grand symbolic gesture in keeping with his emphasis on nuclear nonproliferation.
Human skin has properties that are hard to mimic, but a Stanford engineer is working to create a type of artificial skin that can sense, heal and generate its own power.
A Medicare project will test a new approach for paying primary care doctors that could save money while encouraging physicians to explore alternative ways to serve patients.
Riot police with tear gas and stun grenades faced off with fence-storming migrants and refugees at the border between Greece and Macedonia on Sunday. Tens of thousands of migrants are stranded there.
Early in the 20th century, the world had some 100,000 tigers, according to estimates. The number fell sharply over time — but the World Wildlife Fund says it has now risen for the first time in years.