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CERN can attain a couple of TeV, and has a 14 TeV machine under
construction.
* Each second, about 200 cosmic ray particles with energies of a few million
electron volts (10^6eV) strike every square meter of the earth.
* Above the energy of 10^18eV, only one particle each week falls on an area
of one square kilometer.
* Above the energy of 10^20eV, only one particle falls on a square kilometer
in a century.