Where do random numbers come from?

perl -e "print rand(1);" 0.116790771484375

0.8798828125 0.692291259765625 0.1729736328125

excel: = RAND() 0.4854394999892640 0.6391685278993980

0.1009497853098360

f77: write(*,'(f29.15)') rand(1) 0.513854980468750

0.175720214843750 0.308624267578125

Mathematica: Random[Real, {0,1}] 0.7474293274369694

0.5081794113149011 0.02423389638451016

X Î {0,1}

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