| #1232 | Realistic Criteria | Jul 1, 2013 |
| #1231 | Habitable Zone | Jun 28, 2013 |
| #1230 | Polar/Cartesian | Jun 26, 2013 |
| #1229 | Screensaver | Jun 24, 2013 |
| #1228 | Prometheus | Jun 21, 2013 |
| #1227 | The Pace of Modern Life | Jun 19, 2013 |
| #1226 | Balloon Internet | Jun 17, 2013 |
| #1225 | Ice Sheets | Jun 14, 2013 |
| #1224 | Council of 300 | Jun 12, 2013 |
| #1223 | Dwarf Fortress | Jun 10, 2013 |
| #1222 | Pastime | Jun 7, 2013 |
| #1221 | Nomenclature | Jun 5, 2013 |
| #1220 | Hipsters | Jun 3, 2013 |
| #1219 | Reports | May 31, 2013 |
| #1218 | Doors of Durin | May 29, 2013 |
| #1217 | Cells | May 27, 2013 |
| #1216 | Sticks and Stones | May 24, 2013 |
| #1215 | Insight | May 22, 2013 |
| #1214 | Geoguessr | May 20, 2013 |
| #1213 | Combination Vision Test | May 17, 2013 |
| #1212 | Interstellar Memes | May 15, 2013 |
| #1211 | Birds and Dinosaurs | May 13, 2013 |
| #1210 | I'm So Random | May 10, 2013 |
| #1209 | Encoding | May 8, 2013 |
| #1208 | Footnote Labyrinths | May 6, 2013 |
| #1207 | AirAware | May 3, 2013 |
| #1206 | Einstein | May 1, 2013 |
| #1205 | Is It Worth the Time? | Apr 29, 2013 |
| #1204 | Detail | Apr 26, 2013 |
| #1203 | Time Machines | Apr 24, 2013 |
| #1202 | Girls and Boys | Apr 22, 2013 |
| #1201 | Integration by Parts | Apr 19, 2013 |
| #1200 | Authorization | Apr 17, 2013 |
| #1199 | Silence | Apr 15, 2013 |
| #1198 | Geologist | Apr 12, 2013 |
| #1197 | All Adobe Updates | Apr 10, 2013 |
| #1196 | Subways | Apr 8, 2013 |
| #1195 | Flowchart | Apr 5, 2013 |
| #1194 | Stratigraphic Record | Apr 3, 2013 |
| #1193 | Externalities | Apr 1, 2013 |
| #1192 | Humming | Mar 29, 2013 |
| #1191 | The Past | Mar 27, 2013 |
| #1190 | Time | Mar 25, 2013 |
| #1189 | Voyager 1 | Mar 22, 2013 |
| #1188 | Bonding | Mar 20, 2013 |
| #1187 | Aspect Ratio | Mar 18, 2013 |
| #1186 | Bumblebees | Mar 15, 2013 |
| #1185 | Ineffective Sorts | Mar 13, 2013 |
| #1184 | Circumference Formula | Mar 11, 2013 |
| #1183 | Rose Petals | Mar 8, 2013 |