Answers

2015-03-23T16:54:46+05:30
The first person known to have proposed a heliocentric system  it was Aristarchus and is said to have proved the heliocentric theory.

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2015-03-23T17:01:35+05:30
The Italian Agostino Bassi was the first person to prove that a disease was caused by a microorganisms.
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