| 1. | | Frosted Dunes on Mars (nasa.gov) |
| 1 point by psgbg on June 8, 2016 | past |
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| 2. | | The Thors Hammer Experiment – Potassium vs. Ice (youtube.com) |
| 1 point by psgbg on Oct 12, 2015 | past |
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| 3. | | Youtuber reveals why sodium explodes in water (youtube.com) |
| 4 points by psgbg on Jan 30, 2015 | past |
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| 4. | | Solar Roadways, IMPORTANT QUESTIONS AND ANSWERS by Thunderf00t (youtube.com) |
| 1 point by psgbg on June 9, 2014 | past |
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