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  1. 19277

    In the era before global positioning system (GPS) instruments, determining longitude was difficult since it required a fairly accurate clock, in addition to a sextant. I was under the impression that one of the clocks Lewis and Clark used was Jupiter’s moon Io, which would have made them pretty sophisticated navigators. Michael D. DelanoBrooklyn, N.Y. […]

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  2. Earth

    North vs. Northwest: Lewis and Clark diaries provide directional clue

    Observations from the Lewis and Clark expedition may offer insight into Earth's magnetic field.

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  3. Health & Medicine

    Timing That First Spoonful: Diabetes risk reflects when cereals enter infant diet

    The timing of cereals' introduction into children's diets may affect their risk of developing type 1 diabetes, two studies suggest.