The U.S.-based scientists outlined their final analysis based on more than 10 years of research and 500 trillion particle collisions using the U.S. Department of Energy's Fermilab Tevatron collider near Batavia, Illinois, whose budgetary woes shut it down last year.

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The cosmic ray particle physics detector was carried to the International Space Station on the final flight of the space shuttle Endeavour and installed under NASA direction.

CNN: Space station detector gives first clues to 'dark matter'