The regulation of air pollution that crosses state borders

As many of us were reminded last summer when forest fires in Canada turned New York City's air to the color orange, air pollution is transported by the wind. Fortunately, here in the United States, the Commerce Clause of ...

When ET calls, can we be sure we're not being spoofed?

Scientists have devised a new technique for finding and vetting possible radio signals from other civilizations in our galaxy—a major advance in the search for extraterrestrial intelligence (SETI) that will significantly ...

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