WHEN WAS EARTH MADE UP OF?, 4.6 BILLION YEARS AGO, 500 BILLION YEARS AGO, 1 BILLION YEARS AGO, 4.6 TRILLION YEARS AGO, WHO DISCOVERED GRAVITY?, HUTCHING GODDARD, ISAAC NEWTON, Galileo Galilei, WHO LAUNCHED THE FIRST ROCKET?, HUTCHING GODDARD, Galileo Galilei, Neil Armstrong, THE FIRST MAN ON MOON?, Neil Armstrong, GALILIEO GALILEI, HUTCHING GODDARD, THE FATHER OF ANTISEPTIC SURGERY?, JOSEPH LISTER, GALILIEO GALILEI, Neil Armstrong.

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