A necessity in hard-hit countries and soon to be necessary in areas as the second wave begins to hit. Masks will be with us for some time and that means change.
We need civilian covid mask standards and testing. This seems like a natural project for more than a few universities.
If you're looking for a challenging jigsaw puzzle, a friend recommends Stave puzzles. Spendy and probably worth it if you count the hours needed to solve the more difficult ones. The more complex models have a long lead time.