Talk of the Nation

Writer Donna Britt's 26-year-old brother was killed by Indiana police officers decades ago. Amidst the news of Trayvon Martin's death, she is reminded of the unanswerable questions surrounding her brother's death. She talks about the challenges of coming to terms the violent death of a loved one.

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NEAL CONAN, HOST:

At least 70 countries, including the U.S., pledged millions of dollars in aid to the Syrian opposition. U.N.-Arab League envoy Kofi Annan has set a deadline of April 10 for compliance with the U.N. peace plan. Some analysts believe it's too late for peaceful negotiations.

Want to hear a joke about sodium hypobromite? NaBrO! Can science be the butt of a good joke? Ira Flatow and guests test the hypothesis in an annual April Fools' joke-a-thon. They share the best gags in the business. Sidesplitting or groan-worthy? You decide.

This mystery has plagued arachnologists for decades. William Eberhard and Daniel Briceno untangle the web question in a paper in the journal Naturwissenschaften. The answer has to do with spiders' oily, hairy legs.

In The Age of Insight: The Quest to Understand the Unconscious in Art, Mind and Brain, Nobel Prize-winning neuroscientist Eric Kandel writes of turn-of-the-century Vienna, where artists mingled with writers, scientists and physicians, and explains how the brain perceives a work of art.

The film director James Cameron has just completed a dive to Challenger Deep, the deepest point on Earth at nearly 36,000 feet under the sea. His manned descent is the first in 52 years, since the oceanographers Don Walsh and Jacques Piccard explored the Mariana Trench in the bathyscaphe Trieste.

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NEAL CONAN, HOST:

This is TALK OF THE NATION. I'm Neal Conan in Washington. All this week, the U.S. SUPREME COURT commanded the nation's attention through three days of oral arguments on what may well be its most important case in decades.

The court's ruling could affect the lives of millions, redefine the role and limits of the federal government, and change the character of the 2012 election. We don't expect to know how the justices will rule until late June, but that doesn't stop journalists and legal experts from reading between the lines.