Actually education is probably the largest selection factor. Educated people have less children than less educated people. Sometimes massively so. This is not necessarily linked with intelligence, it correlates more with socio economic factors.
The info graphic suggests that they use the different cooling rate of the first and second layer to lock in the applied magnetic field of heat assisted magnetic recording.
They beat both layers
They apply a magnetic field to save a “1” bit
Both layers are magnetized to a “1” bit
The first layer cools down and locks that bit into place permanently.
They apply the magnetic field to save a “0” bit
While the second layer is still hot and accepts the “0” orientation of the magnetic field, the first layer is already too cold and will not change its magnetization.
The second layer cools down and locks that bit into place.
Neat!
Plenty of answers already.
I’d like to point out that it’s not medicine alone, but empathy that changes natural selection. We have evidence of our ancestors caring for members of their tribe that would have been unable to survive otherwise.
But while in some edge cases (some diseases) you could make an argument that it’s bad for future humanity for some reason, it’s overall good, because it enables a larger population. And a larger population has a better chance of mutating to fit changing environments. Or to phrase it differently: diversification comes first, selection can wait.