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Dominick D./ CC-BY-SA 2.0 Troian Bellasario, Ashley Benson, Lucy Hale, Shay Mitchell and Sasha Pieterse (L to R) have starred in the hit teen drama since 2010.

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Dominick D./ CC-BY-SA 2.0 Ashley Benson, Lucy Hale and Shay Mitchell (L to R) have starred in the hit teen drama since 2010.

21 And Over, Of Course!

PUBLIC DOMAIN Growing crops will be necessary for survival in space, a possibility due to the new NASA bill.

Grave Humor: April 20

PUBLIC DOMAIN Growing crops will be necessary for survival in space, a possibility due to the new NASA bill.

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PUBLIC DOMAIN Growing crops will be necessary for survival in space, a possibility due to the new NASA bill.

Public Domain A rare gene mutation may make those who have it more tired.

PUBLIC DOMAIN A mutation in a particular gene causes people’s days to be longer.

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PUBLIC DOMAIN A mutation in a particular gene causes people’s days to be longer.

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PUBLIC DOMAIN There are higher carbon emissions in states with a higher concentration of wealth.

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Public Domain A rare gene mutation may make those who have it more tired.

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olaf tausch/CC-by-3.0 Tadpole tail tissue was used to regenerate fully functional eyes.

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Karl marquez/CC-By--SA-3.0 Stem cells can regrow various tissues.

WAMM/CC-By-3.0 Compounds in synthetic marijuana have harmful side effects, unlike natural marijuana.

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WAMM/CC-By-3.0 Compounds in synthetic marijuana have harmful side effects, unlike natural marijuana.

SayCheeeeeese/Public domain A new type of solar cell is both highly efficient and long-lasting.

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SayCheeeeeese/Public domain A new type of solar cell is both highly efficient and long-lasting.

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PUBLIC DOMAIN The discovery of where blood comes from could give insights on blood-related diseases.