75 trillion (living) cells receive blood from the heart, except for which body part?
Question[/su_hr]Humans have caused how many animal extinctions over the past 500 years?
Question[/su_hr]According to the late Stephen Hawking, a single human’s DNA contains as much information as roughly how many novels?
Question[/su_hr]After the fall of the Roman Empire, the technology to make concrete was lost for how many years?
Question[/su_hr]The average human body has enough iron in it to make a metal nail that is how many inches long?
Question[/su_hr]The paint on the Eiffel Tower weighs as much as how many elephants?
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