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1.
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landing on the moon
(1345)
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2.
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wheel
(1034)
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3.
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Internet
(1000)
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4.
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the wheel
(793)
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5.
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Discovery of Penicillin
(414)
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6.
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Electricity
(379)
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7.
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Computers
(345)
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8.
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medicine
(310)
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9.
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Antibiotics
(310)
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10.
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Agriculture
(310)
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11.
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12.
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Fire
(276)
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13.
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TV
(241)
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14.
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15.
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Sending Men to the Moon
(207)
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16.
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Flight
(207)
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17.
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Tools
(207)
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18.
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Printing
(207)
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19.
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20.
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Womens Right to Vote
(207)
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21.
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Dont
(207)
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22.
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Written Language
(207)
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23.
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24.
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Polio Vaccine
(207)
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25.
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red
(207)
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26.
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Harnessing Electricity
(172)
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