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  1. Math

    Tetris Is Hard

    As many computer- and video-game players have long known, the insanely addictive, immensely popular game of Tetris is tough. You can’t really win; you merely try your best to improve upon previous results. The seven tetrominoes of Tetris. The game was invented in 1985 by mathematician Alexey Pajitnov, then a computer engineer at the Academy […]

    By Ivars Peterson
  2. Animals

    Upside Way Down: Video turns fish story on its head

    The first video of whipnose anglerfish reveals them swimming upside down and trolling for prey on the 5,000-meter deep ocean floor.

    By Carol Marzuola
  3. Health & Medicine

    Blood Booster: Growth signal shifts cord stem cells into high gear

    A protein called Delta-1 stimulates stem cells in umbilical cord blood to proliferate in a lab dish, attach well to bone marrow when implanted into mice, and even proceed to the animal's thymus to become T cells.