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European drug regulators are warning that the emergency contraceptive called Plan B does not work in women who weigh 176 pounds or more. The warning follows a September study showing an increased number of pregnancies in women who had taken Plan B.

Astronomers will turn skyward to glimpse ISON, an unusual comet from the outermost edge of our solar system that is now plunging toward the sun. ISON could yield clues to the formation of the solar system, and may become visible to the naked eye in December — if it survives.

Crowdfunding is popular among musicians, filmmakers and artists looking for a way to finance their next project. Now the Securities and Exchange Commission is considering rules that would allow small companies to solicit investments over the Internet and sell shares to the public.

David Greene talks to David Smith, of The Guardian, about the deteriorating situation in the Central African Republic. The former French colony has been described as "on the verge of genocide" as sectarian violence has worsened.

When Iran's foreign minister confirmed a landmark nuclear deal, he made the announcement via Twitter. Most Iranians have a hard time accessing Twitter freely. David Greene talks to Babak Rahimi, associate professor of communication, culture and religious studies at the University of California, San Diego.

Watch out if you're planning to be on the roads Wednesday: A storm that's already caused some deaths and many problems across the southwest and southern states continues to take aim at the eastern half of the nation. With more than 43 million Americans expected to travel in coming days, the weather is going to complicate many trips.

Virginia State Sen. Creigh Deeds was attacked and seriously wounded by his adult son, who then committed suicide. Deeds says the state's mental health system failed. He says his life's work now "is to make sure other families don't have to go through what we are living."

In England, Thanksgiving sometimes calls for innovation.

Bill Clinton went vegan as a radical attempt to reform his health. But Gore has been cutting back on meat since 2009, out of concern about the impacts of animal production on climate change.

Gay marriage won't be legal in the state until June, but two Chicago women have been granted permission to marry immediately because one of them has terminal cancer.