As vaccine approval nears, you've no doubt heard proposals to speed up vaccine testing with what is known as a "challenge" trial, where you deliberately infect volunteers with the virus. This approach is controversial, but has been around for some time. There are already organizations collecting volunteers, and tens of thousands have signed up.

It occurred to me, learning that 80% of Covid infected patients lose their sense of smell (Anosmia) that it should be possible to build the cheapest and most effective Covid screener (for use at entrances to schools/airports/buildings/restaurants) with a simple "scratch-n-sniff" card. These cards, which cost pennies, would come with a set of scratch squares, and under each would be boxes with the names of possible scents. A QR code would (encrypted) have the answer. You sniff, check the boxes and then a phone or other device scans your answer.

When elections are close, they get chaotic. If the flip of a single vote, at the tie-point, can cause a massive change, like who runs a country, things can go nuts. People will do everything, from legal battles all the way up to the supreme court, to voter suppression, to voter fraud, to fake claims of voter fraud, all to move the needle a tiny bit around that tipping point.