| #2230 | Versus Bracket | Nov 18, 2019 |
| #2229 | Rey and Kylo | Nov 15, 2019 |
| #2228 | Machine Learning Captcha | Nov 13, 2019 |
| #2227 | Transit of Mercury | Nov 11, 2019 |
| #2226 | Recombination And Reionization | Nov 8, 2019 |
| #2225 | Voting Referendum | Nov 6, 2019 |
| #2224 | Software Updates | Nov 4, 2019 |
| #2223 | Screen Time | Nov 1, 2019 |
| #2222 | Terminator: Dark Fate | Oct 30, 2019 |
| #2221 | Emulation | Oct 28, 2019 |
| #2220 | Imagine Going Back in Time | Oct 25, 2019 |
| #2219 | Earthquake Early Warnings | Oct 23, 2019 |
| #2218 | Wardrobe | Oct 21, 2019 |
| #2217 | 53 Cards | Oct 18, 2019 |
| #2216 | Percent Milkfat | Oct 16, 2019 |
| #2215 | Faculty:Student Ratio | Oct 14, 2019 |
| #2214 | Chemistry Nobel | Oct 11, 2019 |
| #2213 | How Old | Oct 9, 2019 |
| #2212 | Cell Phone Functions | Oct 7, 2019 |
| #2211 | Hours Before Departure | Oct 4, 2019 |
| #2210 | College Athletes | Oct 2, 2019 |
| #2209 | Fresh Pears | Sep 30, 2019 |
| #2208 | Drone Fishing | Sep 27, 2019 |
| #2207 | Math Work | Sep 25, 2019 |
| #2206 | Mavis Beacon | Sep 23, 2019 |
| #2205 | Types of Approximation | Sep 20, 2019 |
| #2204 | Ksp 2 | Sep 18, 2019 |
| #2203 | Prescience | Sep 16, 2019 |
| #2202 | Earth-Like Exoplanet | Sep 13, 2019 |
| #2201 | Foucault Pendulum | Sep 11, 2019 |
| #2200 | Unreachable State | Sep 9, 2019 |
| #2199 | Cryptic Wifi Networks | Sep 6, 2019 |
| #2198 | Throw | Sep 3, 2019 |
| #2197 | Game Show | Sep 2, 2019 |
| #2196 | Nice To E-Meet You | Aug 30, 2019 |
| #2195 | Dockless Roombas | Aug 28, 2019 |
| #2194 | How to Send a File | Aug 26, 2019 |
| #2193 | Well-Ordering Principle | Aug 23, 2019 |
| #2192 | Review | Aug 21, 2019 |
| #2191 | Conference Question | Aug 19, 2019 |
| #2190 | Serena Versus the Drones | Aug 16, 2019 |
| #2189 | Old Game Worlds | Aug 14, 2019 |
| #2188 | E Scooters | Aug 12, 2019 |
| #2187 | Geologic Time | Aug 9, 2019 |
| #2186 | Dark Matter | Aug 7, 2019 |
| #2185 | Cumulonimbus | Aug 5, 2019 |
| #2184 | Unpopular Opinions | Aug 2, 2019 |
| #2183 | Icon Swap | Jul 31, 2019 |
| #2182 | When I'm Back at a Keyboard | Jul 29, 2019 |
| #2181 | Inbox | Jul 26, 2019 |