In 2011, researchers at CERN found a way to trap and hold particles of antihydrogen for about 15 minutes at a time. Jeffrey Hangst, spokesman for the ALPHA project at CERN, describes how scientists are trying to measure basic properties of the particles, such as their mass.
Source: http://www.npr.org/templates/story/story.php?storyId=180824404&ft=1&f=1007
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