Check out Technology Connections on YouTube. Specifically this playlist on heat pumps.

The only thing more efficient would be mechanized Solar shades and passive techniques.

My wild speculation:

Viral snares/traps? Semi-permeable membrane + RNA; the virus gets in and binds to the RNA inside, then the viral package is “spent” on fake RNA that can’t replicate. There are hundreds of these vaults within the cell, as to create a bunch of “pits” that a virus could fall into, thus effectively slowing viral spread, even a little?

Depends how fast you do it.

Same sentiment here. I always try to care a bit more than the other person so that, assuming most people use proportional caring implicitly, the mutual care can increase steadily.