Testing if Sharks Can Smell a Drop of Blood

We've all heard it.  You know the myth.  The story about how sharks can smell a drop of blood from 1,000 miles away or some nonsense.  On top of that, we've all questioned it.  Is it true?  Welp, enter Mark Rober to answer the age-old question, can sharks really smell a drop of blood in the water?

Mark Rober YouTube Channel: https://www.youtube.com/user/onemeeeliondollars