Some scientists think that humans may have crossed the ocean
a) people in the south america speak spanish
b) artifacts from ancient sailors have been found
c) artifacts in spain and north america are alike
d) they found paintings of people crossing water

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randy pausch was a famous mathematician, writer and lecturer who is particularly famous for his last speech, given in 2007, "the las lecture", because he illustrates why one's dreams need to be pursued in a logical order if success is to be obtained, option c. at this time, pausch had been diagnosed with terminal cancer so he told the audience to follow their childhood dreams, which were possible to achieve. it has been recognized as one of the best motivational speech around the world.

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