In line with my self-appointed mission of cleaning up the language of evolutionary science, I offer this.
The current issue of the Skeptic contains a chapter of a book about evolution. The author writes of “[Darwin’s] discovery of the theory of evolution by means of natural selection”. I submit that the correct description is “the theory of evolution by means of descent with random modification”.
I see the concept of “natural selection” as a purely physical layer atop something more fundamental and more important to the theory. Every inanimate and animate thing changes all the time (time == change). Some living individual things prosper more than others in their current environment. The physical earth-water-air-light environment of an individual living thing usually changes relatively slowly, but the living food-family-competitors environment of an individual living thing often changes quickly. Because an individual living thing’s DNA cannot change, individuals must die. These facts drive why living things must evolve or else disappear, but they are mostly independent of how living things evolve. Living lineages evolve (change) only through descent with modification, which Darwin saw and described clearly although without knowing the mechanisms.
Descent with modification has been completely random for billions of years: random flaws in protein replication, and random recombination of genes in sexual reproduction.
But humans can now carry out purposeful, directed evolution, for example by using CRISPR to wipe out malaria by genetically engineering the mosquitoes through which it spreads, or to wipe out Lyme disease by genetically engineering the rodents through which it spreads.
We are at a singularity. Now.