These Are the 6 Longest Train Rides in the U.S.—Including a 65-hour Journey

Train travel is all about sitting back and settling in. Its greatest luxury is space and time: no middle seats, generous ...
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Are we really made of 'star stuff?' Learn about your body's elements

Astrophysicist Suzanna Randall explains where the elements in our body come from in this episode of "Starlight" from the European Southern Observatory. Credit: ESO Directed by: Martin Wallner, Luis ...