| #2547 | Siren | Nov 26, 2021 |
| #2546 | Fiction vs Nonfiction | Nov 24, 2021 |
| #2545 | Bayes' Theorem | Nov 22, 2021 |
| #2544 | Heart-Stopping Texts | Nov 19, 2021 |
| #2543 | Never Told Anyone | Nov 17, 2021 |
| #2542 | Daylight Calendar | Nov 15, 2021 |
| #2541 | Occam | Nov 12, 2021 |
| #2540 | TTSLTSWBD | Nov 10, 2021 |
| #2539 | Flinch | Nov 8, 2021 |
| #2538 | Snack | Nov 5, 2021 |
| #2537 | Painbow Award | Nov 3, 2021 |
| #2536 | Wirecutter | Nov 1, 2021 |
| #2535 | Common Cold Viruses | Oct 29, 2021 |
| #2534 | Retractable Rocket | Oct 27, 2021 |
| #2533 | Slope Hypothesis Testing | Oct 25, 2021 |
| #2532 | Censored Vaccine Card | Oct 22, 2021 |
| #2531 | Dark Arts | Oct 20, 2021 |
| #2530 | Clinical Trials | Oct 18, 2021 |
| #2529 | Unsolved Math Problems | Oct 15, 2021 |
| #2528 | Flag Map Sabotage | Oct 13, 2021 |
| #2527 | New Nobel Prizes | Oct 11, 2021 |
| #2526 | TSP vs TBSP | Oct 8, 2021 |
| #2525 | Air Travel Packing List | Oct 6, 2021 |
| #2524 | Comet Visitor | Oct 4, 2021 |
| #2523 | Endangered | Oct 1, 2021 |
| #2522 | Two-Factor Security Key | Sep 29, 2021 |
| #2521 | Toothpaste | Sep 27, 2021 |
| #2520 | Symbols | Sep 24, 2021 |
| #2519 | Sloped Border | Sep 22, 2021 |
| #2518 | Lumpers and Splitters | Sep 20, 2021 |
| #2517 | Rover Replies | Sep 17, 2021 |
| #2516 | Hubble Tension | Sep 15, 2021 |
| #2515 | Vaccine Research | Sep 13, 2021 |
| #2514 | Lab Equipment | Sep 10, 2021 |
| #2513 | Saturn Hexagon | Sep 8, 2021 |
| #2512 | Revelation | Sep 6, 2021 |
| #2511 | Recreate the Conditions | Sep 3, 2021 |
| #2510 | Modern Tools | Sep 1, 2021 |
| #2509 | Useful Geometry Formulas | Aug 30, 2021 |
| #2508 | Circumappendiceal Somectomy | Aug 27, 2021 |
| #2507 | USV-C | Aug 25, 2021 |
| #2506 | Projecting | Aug 23, 2021 |
| #2505 | News Story Reaction | Aug 20, 2021 |
| #2504 | Fissile Raspberry Isotopes | Aug 18, 2021 |
| #2503 | Memo Spike Connector | Aug 16, 2021 |
| #2502 | Every Data Table | Aug 13, 2021 |
| #2501 | Average Familiarity | Aug 11, 2021 |
| #2500 | Global Temperature Over My Lifetime | Aug 9, 2021 |
| #2499 | Abandonment Function | Aug 6, 2021 |
| #2498 | Forest Walk | Aug 4, 2021 |