Dark matter is the unknown substance thought to make up some 27 percent of the universe. It can’t be observed but only theorized.
It’s too bad biologists are not as open about crises in their theories. It’s the sign of a healthy science.
The Big Bang theory also gives us an age for the universe. The latest estimate, based on several cosmological observations, is 13.80 +/- 0.02 billion years.
Scientists find the most interesting things when they suspect function in poorly understood parts of the genome.