Party balloons can no longer be taken for granted: there鈥檚 a worldwide shortage of helium. Prices quadrupled between 2000 and 2012, according to the U.S. Government Accountability Office. But a new helium-recovery system will put 新澳彩开奖结果鈥檚 science laboratories at the forefront of efforts to conserve the dwindling supply of this increasingly expensive gas.
March 19, 2015