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Today's a good day for gadget enthusiasts. During its I/O event, Google announced that like Microsoft, it was jumping into the tablet market. The search giant made three big announcements: The Nexus 7, its tablet; the Nexus Q, a streaming device; and a new version of its mobile operating system called Jelly Bean.

Often, the familiar hides the deepest mysteries. This is certainly the case with light, one of the take-it-for-granted physical phenomena that surrounds us in everyday life. We wake up to it, we turn it on and off, rarely thinking of what it really is. A good thing, for even the greatest physicists pause before talking about the nature of light.

Early this morning, three armed assailants fire bombed the headquarters of Microsoft in Athens, Greece.

The attackers used a van to ram through the front door and tried to set the building on fire using gasoline, Microsoft Greece's General Manager Ernst-Jan Stigter told reporters. Stigter added that no one was injured.

The AP reports:

Several dozen people know how the Supreme Court will rule on the constitutionality of President Obama's health care law. And it'll stay that way until sometime after 10 a.m. ET on Thursday, when the court releases its opinion to the rest of us.

The decision will have broad societal, economic and legal ramifications, and will play a featured role in the November presidential election. But the justices and their young law clerks — the only ones privy to the deliberations — don't leak opinions. It's virtually unheard of.

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NEAL CONAN, HOST:

This is TALK OF THE NATION. I'm Neal Conan.

While fires don't affect us here in Aspen, other parts of Colorado face dire conditions. In Fort Collins, firefighters and the National Guard have been attempting to contain the huge High Park Fire burning for two weeks now. It's destroyed hundreds of homes and scorched tens of thousands of acres. A lightning-sparked wildfire erupted near Boulder yesterday, but the focus right now is in Colorado Springs where fire swept into the city and forced more than 30,000 people to evacuate their homes.

The biggest surprise Thursday morning at the Supreme Court will be if the justices do not issue their most-anticipated decision of the year — on the constitutionality of the Affordable Care Act; the health care overhaul enacted in 2010.

For the first time in 13 years, the Food and Drug Administration has approved a new drug to help people lose weight.

The FDA gave the green light to Arena Pharmaceuticals to sell Belviq, or lorcaserin generically, a twice-a-day pill that suppresses appetite and appears to affect metabolism by influencing levels of the brain chemical serotonin.

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NEAL CONAN, HOST:

Nora Ephron provided some of the most memorable moments in the movies: "When Harry Met Sally," "Sleepless in Seattle," many other films and, of course, essays and stories. She suffered from leukemia and died last night in New York at the age of 71. Six years ago, she joined us to talk about her book, "I Feel Bad About My Neck," and we concluded that conversation by talking about her last chapter, "Consider the Alternative," where she wrote about regrets, and she cited Edith Piaf's celebrated song "Non, Je Ne Regrette Rien."

With the Republican primary season completed, the presidential campaigns are buckling down for the months ahead. NPR's Ron Elving and political strategists Vin Weber and Anna Greenberg discuss the presidential race, key battleground states and what it will take for candidates Romney or Obama to win in November.

The Pentagon and FBI have conducted more than 100 investigations into possible Islamist extremists inside the U.S. military in the wake of the 2009 shooting at Fort Hood, Texas. NPR's Dina Temple-Raston shares the latest developments and what the military is doing to prevent radicalization within its ranks.

Apparently, it is just what it looks like — frozen foam, on a beer.