Lionfish with their distinctive venomous spines are an invasive species that has thrived in U.S. coastal waters because they have no natural predators -- until now.
The Scripps National Spelling Bee ended in a tie for the third straight year Thursday night. Take a look at the winning words from this year's competition as well as the other winning words dating back to 2001.
Barack Obama made his 10th trip as U.S. president to Asia this week. He spent time in several cities in Vietnam and Japan. On Friday he Obama became the first sitting U.S. president to visit Hiroshima.
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