Despite Jesus's petition "that they may be one," all Christians still cannot eat and drink together at the Lord's Supper. In an effort to move ecumenical conversations forward, Michael Welker, professor of systematic theology at the University of Heidelberg and occasional visiting professor at Princeton, sets out a systematic explanation of what happens at Holy Communion.
The American Association for the Advancement of Science sounds like a feet-on-the-ground organization. But in a recent meeting in Boston some scientists took flight, at least in imagination. They talked about physically possible step-ups in the speed of travel that might make it conceivable to reach a near star.
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