| #562 | Parking | Mar 30, 2009 |
| #561 | Well | Mar 27, 2009 |
| #560 | Lithium Batteries | Mar 25, 2009 |
| #559 | No Pun Intended | Mar 23, 2009 |
| #558 | 1000 Times | Mar 20, 2009 |
| #557 | Students | Mar 18, 2009 |
| #556 | Alternative Energy Revolution | Mar 16, 2009 |
| #555 | Two Mirrors | Mar 13, 2009 |
| #554 | Not Enough Work | Mar 11, 2009 |
| #553 | Pirate Bay | Mar 9, 2009 |
| #552 | Correlation | Mar 6, 2009 |
| #551 | Etch-a-Sketch | Mar 4, 2009 |
| #550 | Density | Mar 2, 2009 |
| #549 | Westley's a Dick | Feb 27, 2009 |
| #548 | Kindle | Feb 25, 2009 |
| #547 | Simple | Feb 23, 2009 |
| #546 | Music DRM | Feb 20, 2009 |
| #545 | Neutrality Schmeutrality | Feb 18, 2009 |
| #544 | Pep Talk | Feb 16, 2009 |
| #543 | Sierpinski Valentine | Feb 13, 2009 |
| #542 | Cover-Up | Feb 11, 2009 |
| #541 | TED Talk | Feb 9, 2009 |
| #540 | Base System | Feb 6, 2009 |
| #539 | Boyfriend | Feb 4, 2009 |
| #538 | Security | Feb 2, 2009 |
| #537 | Ducklings | Jan 30, 2009 |
| #536 | Space Elevators | Jan 28, 2009 |
| #535 | It Might Be Cool | Jan 26, 2009 |
| #534 | Genetic Algorithms | Jan 23, 2009 |
| #533 | Laptop Hell | Jan 21, 2009 |
| #532 | Piano | Jan 19, 2009 |
| #531 | Contingency Plan | Jan 16, 2009 |
| #530 | I'm An Idiot | Jan 14, 2009 |
| #529 | Sledding Discussion | Jan 12, 2009 |
| #528 | Windows 7 | Jan 9, 2009 |
| #527 | Keynote | Jan 7, 2009 |
| #526 | Converting to Metric | Jan 5, 2009 |
| #525 | I Know You're Listening | Jan 2, 2009 |
| #524 | Party | Dec 31, 2008 |
| #523 | Decline | Dec 29, 2008 |
| #522 | Google Trends | Dec 26, 2008 |
| #521 | 2008 Christmas Special | Dec 24, 2008 |
| #520 | Cuttlefish | Dec 22, 2008 |
| #519 | 11th Grade | Dec 19, 2008 |
| #518 | Flow Charts | Dec 17, 2008 |
| #517 | Marshmallow Gun | Dec 15, 2008 |
| #516 | Wood Chips | Dec 12, 2008 |
| #515 | No One Must Know | Dec 10, 2008 |
| #514 | Simultaneous | Dec 8, 2008 |
| #513 | Friends | Dec 5, 2008 |