Why We Sucked At Counting Fish (Until Now)

The video explores the transformation of the Milky Way into a galaxy with 400 billion stars. It contrasts this with the challenge of counting fish in Earth's oceans, traditionally done with trawls. Modern methods using sonar technology have revealed fish populations to be much larger than previously thought, as fish often evade nets. The video highlights the bristle mouth fish as the most populous vertebrate, with a population in the quadrillions, and discusses how deep-sea fish use bioluminescence to communicate and evade capture.

What new insight or understanding did you gain from this video?