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  1. 19615

    This article says that “twice as many … with sleep apnea had a stroke or died of that or another cause. …” This sounds serious, but your readers can’t correctly assign importance to “twice as many” because you omit numbers of deaths. David KollasTolland, Conn. Among the 697 people with sleep apnea, 22 suffered strokes […]

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  2. Astronomy

    Images of a fiery youth

    A faint, infrared glow captured by the Spitzer Space Telescope might be light from the universe's first stars.

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  3. Planetary Science

    Mars or Bust!

    Scientists are working to overcome the biomedical challenges that would hinder a human voyage to Mars.

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  4. Health & Medicine

    Staring into the Dark

    Amid a growing array of medications for treating insomnia, sleep researchers point to large gaps in their knowledge about which of these medicines work best and for how long they remain effective.