It's Puzzles for Progress day! I highly recommend you print this puzzle page out by using the link tinyurl.com/puzzlesforprogress-13. (This page debuts a minor formatting change that should cause the pages to print faster than in the past.) If you'd prefer each puzzle on a separate page, those links are also available below, as well as the link to the answer page:
Just the Nuclei: tinyurl.com/puzzlesforprogress-13-nuclei
Just the Capsules: tinyurl.com/puzzlesforprogress-13-capsules
Just the Spiral (one of my all-time favorite PfP puzzles): tinyurl.com/puzzlesforprogress-13-spiral
The answers: tinyurl.com/puzzlesforprogress-13-answers
