Add Yahoo as a preferred source to see more of our stories on Google. The world's first nuclear clocks have ticked. A team of physicists has demonstrated a working timekeeping device regulated not by ...

April set off down a wooded path on the North Fork, nose to the ground, darting and weaving through the bunchberry, blackberry and ferns. She wore a bright orange vest treated with permethrin to deter ...

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A 15-year-old Canadian student has built a robotic turtle that may point to a quieter, gentler way of watching over underwater ecosystems. The device, known as BURT (Bionic Underwater Robotic Turtle), ...