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woodcut of a groundhog rising from the top of Sage Art Center
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January 31, 2014 | 03:10 pm

Happy Groundhog Day

A Brief History Groundhog Day is celebrated annually on February 2 in the United States and Canada. According to folklore, the groundhog is able to predict the arrival of spring.…

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August 13, 2013 | 02:02 pm

Researchers Optically Levitate a Glowing, Nanoscale Diamond

Researchers at the University of Rochester have measured for the first time light emitted by photoluminescence from a nanodiamond levitating in free space. In a paper published this week in Optics Letters, they describe how they used a laser to trap nanodiamonds in space, and—using another laser—caused the diamonds to emit light at given frequencies.

topics: URnano,