Why is crowd counting so challenging and why do estimates vary? EE explains the science behind crowd counting in relation to the presidential inauguration and ensuing marches. Read the full transcript here: http://bit.ly/2l52eAP

223 EE How Do You Estimate Crowd Size?

How do astronomers photograph a black hole? How often do planes get hit by lightning? What does the EPA actually do? Science is all around us and transforming our world at a rapid pace. Extragalactic astrophysicist Sabrina Stierwalt is here to guide you through it. She'll help you make sense of the everyday and the once-in-a-lifetime. Rights of Albert Einstein are used with permission of The Hebrew University of Jerusalem. Represented exclusively by Greenlight.

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223 EE How Do You Estimate Crowd Size?

223 EE How Do You Estimate Crowd Size?

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