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10,033 things · 1,900 votes cast · cast a vote
All | Arts | Biology and health sciences | Everyday life | Geography | History | Mathematics | People | Philosophy and religion | Physical sciences | Society and social sciences | Technology
| # | Thing | Description | Topic | Up/Down/Net | Score ▼ | |
|---|---|---|---|---|---|---|
| 1101 | Focal length | Measure of how strongly an optical system converges or diverges light | Physical sciences | +0 / -1 / -1 | 0.476190 | |
| 1102 |  | Substance (chemistry) | Form of matter | Physical sciences | +0 / -1 / -1 | 0.476190 |
| 1103 |  | Osmium | Chemical element with atomic number 76 (Os) | Physical sciences | +0 / -1 / -1 | 0.476190 |
| 1104 | Precambrian | History of Earth 4600–539 million years ago | Physical sciences | +0 / -1 / -1 | 0.476190 | |
| 1105 |  | Sandstone | Type of sedimentary rock | Physical sciences | +0 / -1 / -1 | 0.476190 |
| 1106 |  | Cenozoic | Third and current era of the Phanerozoic Eon | Physical sciences | +0 / -1 / -1 | 0.476190 |
| 1107 |  | Hydrochloric acid | Aqueous solution of hydrogen chloride | Physical sciences | +0 / -1 / -1 | 0.476190 |
| 1108 |  | Ammonium nitrate | Chemical compound with formula NH4NO3 | Physical sciences | +0 / -1 / -1 | 0.476190 |
| 1109 |  | Meson | Subatomic particle; made of equal numbers of quarks and antiquarks | Physical sciences | +0 / -1 / -1 | 0.476190 |
| 1110 |  | Dwarf galaxy | Small galaxy composed of up to several billion stars | Physical sciences | +0 / -1 / -1 | 0.476190 |
| 1111 |  | Cambrian | First geological period of the Paleozoic Era | Physical sciences | +0 / -1 / -1 | 0.476190 |
| 1112 |  | Sodium hydroxide | Caustic soda, with formula NaOH | Physical sciences | +0 / -1 / -1 | 0.476190 |
| 1113 |  | Gauge theory | Physical theory with fields invariant under the action of local "gauge" Lie groups | Physical sciences | +0 / -1 / -1 | 0.476190 |
| 1114 |  | Great Oxidation Event | Paleoproterozoic surge in atmospheric oxygen | Physical sciences | +0 / -1 / -1 | 0.476190 |
| 1115 |  | Tsunami | Series of water waves | Physical sciences | +0 / -1 / -1 | 0.476190 |
| 1116 |  | Tropical climate | Major climate group in Köppen classification | Physical sciences | +0 / -1 / -1 | 0.476190 |
| 1117 |  | Zinc | Chemical element with atomic number 30 (Zn) | Physical sciences | +0 / -2 / -2 | 0.454545 |
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