Debunking the idea that most humans only use 10 percent of our brains, which is a starting point for the Scarlett Johansson/Luc Besson movie Lucy, was popular last week.
Many media outlets and popular Web sites took on this task. Emoryâ€™s Krish Sathian â€“ known for his work on rehabilitation, how the brain processes sensory experiences and how we understand metaphors â€“ does an able job of it in the video below.
But a related question is still a matter of debate: how much of our DNA do we â€œuseâ€? This is an important question for geneticists because it seeks to define the most productive mutation hunting grounds.
A study published in PLOS Genetics last week concluded that just 8.2 percent of the human genome is constrained during evolution and is likely to be â€œfunctionalâ€. TheÂ press releaseÂ on this paper pointed out sharply that this contrasts with the more expansive analysis from the multinational ENCODE project, which assigned some biochemical function to 80 percent of the human genome.