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  1. Math

    Fractured Granite and Fractal Prints

    A rectangular slab of polished granite gives an impression of solidity and permanence. With its straight lines and glossy surface, it’s an elegant, humanmade artifact meant to stand as a timeless monument or serve as an impermeable skin for a sleek skyscraper. A fractal stone print. Nat Friedman A two-sided fractal stone print by Nat […]

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  2. Paleontology

    Fossils of early salamanders found

    A recent discovery of fossilized salamanders pushes back a milestone in amphibian evolution by more than 100 million years.

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  3. Sperm show age

    The quality of a man's sperm declines as he gets older.

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  4. Sleep debt exacts deceptive cost

    Moderate but sustained sleep deficits undermine alertness and other mental faculties to a potentially dangerous extent, although people who experience this level of sleep loss usually don't feel particularly drowsy.