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2014-02-13
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2014-02-04
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888,817 views
2014-02-03
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2014-01-30
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225,676 views
2014-01-29
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716,818 views
2014-01-28
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1,924,594 views
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3,217,335 views
2014-01-21
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24,855,742 views
2014-01-16
Start a TED-Ed Club today!
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2014-01-14
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2014-01-07
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2014-01-06
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3,150,759 views
2014-01-02
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1,716,497 views
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528,064 views
2013-12-17
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447,256 views
2013-12-16
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2013-12-12
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127,834 views
2013-12-11
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376,271 views
2013-12-10
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2013-12-09
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2013-12-05
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2013-12-03
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2013-12-02
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2013-11-26
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129,198 views
2013-11-21
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2013-11-19
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760,378 views
2013-11-18
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2013-11-14
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459,244 views
2013-11-12
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414,462 views
2013-11-11
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2,403,878 views
2013-11-07
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796,225 views
2013-11-05
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3,086,478 views
2013-11-04
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3,817,367 views
2013-10-29
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1,060,091 views
2013-10-24
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1,886,662 views
2013-10-22
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3,875,731 views
2013-10-21