P_Q, tusnami caused MASS DESTRUCTION not MASS EXTINCTION. Piseces bro, maybe small pox wasnt the right disease to give an example off, but how abt plaque? tyo musa le lagne rogg le tetro manche mareko hoina england ma ? didnt they think it was a curse to human beings? bro, yo sabai kura haru khali "time Pass" garna ho. Gallactic collision re, sab bhanda wahiyaah, kura. On what basis, do u say, there will be a gallactic collision, by the theories and equations that is calculated by us? Bro, if you beilive those things then i will tell you string theory describes universe very differently then Theory of Relativity. "which I have never heard about. I dont think Epidemic can bring Mass extinction. " i think u need to watch, Discovery Science more often. You know things thats hot on "WMD" right now, its bio weapon. (whatever they call it) . those Anthrax and other bio chemical weapons.... at the end, i am not saying they sudnt do this stuff, when these research's are funded ppl get job and food.