United Nations observers have entered the Syrian town of Tremseh to investigate an attack reported to be the bloodiest so far since the uprising against President Bashar Assad.

The details of the incident are unclear, as The Associated Press reports:

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SCOTT SIMON, HOST:

It's been over a week since scientists announced that they've found the Higgs boson particle. It's an important discovery. They say that although the Higgs boson particle is small - or, come to think of it, perhaps because of it - it holds the universe together. But for all the publicity the particle's received, how many of us could explain what it actually does? Well, here's the announcement from scientists in Switzerland.

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This is WEEKEND EDITION from NPR News. I'm Scott Simon.

There's more gloomy news from the eurozone this week. Italy saw its sovereign debt rating lowered by one agency, at just a couple of notches above junk status. In Spain, civil servants, coalminers, and others took to the streets once again to protest more spending cuts and tax hikes. And Germany's highest court heard arguments challenging the constitutionality of two measures considered central to efforts to try to contain the euro crisis.

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There may be no better town in America for observing the heavens than Tucson, Arizona. It has low humidity, high elevation and a darkened desert. That part of the state has attracted quite a few astronomers, both professional and amateur. We sent NPR's Peter Breslow to Tucson to seek out this community of stargazers.

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Fifty years ago this week, communications went global. July 12, 1962 the Telstar 1 satellite from AT&T became the first commercial spacecraft to beam television images from the United States to Europe.

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