BrainStuff: Why Is Blood Red?
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1:27
HowStuffWorks_Science
3 years agoJoseph Friedman: The Flexible Straw
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HowStuffWorks_Science
4 years agoBrainStuff: Why Are Stop Signs Red?
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KIVI
4 years agoWW: Red Cross Winter Blood Donations
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DiabeticDiary
4 years agoDried Red Dates - Blood Sugar Test
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KIVI
4 years agoRed Cross Seeking Blood and Plasma Donations
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HowStuffWorks_Science
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JoeBobLong
4 years ago $0.01 earnedFerst blood
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KIVI
4 years agoRed Cross in Need of Blood Donations
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WFTX
4 years agoOne blood holds blood drive
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2:21
HowStuffWorks_Science
3 years agoBrainStuff: Why Don't Humans Have Tails?
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