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| # | Thing | Description | Topic | Up/Down/Net | Score ▼ | |
|---|---|---|---|---|---|---|
| 851 |  | Ruby | Variety of corundum, mineral, gemstone | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 852 |  | Ruthenium | Chemical element with atomic number 44 (Ru) | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 853 | Rutherford scattering experiments | Experiments proving existence of atomic nuclei | Physical sciences | +0 / -0 / 0 | 0.500000 | |
| 854 |  | Sagittarius A* | Supermassive black hole at the center of the Milky Way | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 855 |  | Salt (chemistry) | Chemical compound involving ionic bonding | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 856 |  | Sand | Granular material composed of finely divided rock and mineral particles | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 857 |  | Sapphire | Gem variety of the mineral corundum | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 858 |  | Saturn | Sixth planet from the Sun | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 859 |  | Savanna | Mixed woodland-grassland ecosystem | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 860 |  | Scandium | Chemical element with atomic number 21 (Sc) | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 861 |  | Scattering | Range of physical processes in physics | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 862 |  | Schist | Easily split medium-grained metamorphic rock | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 863 | Schrödinger equation | Description of a quantum-mechanical system | Physical sciences | +0 / -0 / 0 | 0.500000 | |
| 864 | Science | Systematic endeavour to gain knowledge | Physical sciences | +0 / -0 / 0 | 0.500000 | |
| 865 | Scientific law | Statement based on repeated empirical observations that describes some natural phenomenon | Physical sciences | +0 / -0 / 0 | 0.500000 | |
| 866 | Scientific method | Interplay between observation, experiment, and theory in science | Physical sciences | +0 / -0 / 0 | 0.500000 | |
| 867 |  | Scientific modelling | Scientific activity that produces models | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 868 | Scientific theory | Falsifiable explanation of natural phenomena | Physical sciences | +0 / -0 / 0 | 0.500000 | |
| 869 |  | Sea | Large body of salt water | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 870 |  | Sea ice | Outcome of seawater as it freezes | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 871 |  | Seabed | Bottom of the ocean | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 872 |  | Seamount | Mountain rising from the ocean seafloor that does not reach the water's surface | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 873 |  | Season | Division of the year | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 874 |  | Second | SI unit of time | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 875 |  | Sedimentary basin | Regions of long-term subsidence creating space for infilling by sediments | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 876 |  | Sedimentary rock | Rock formed by the deposition and cementation of particles | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 877 |  | Seismology | Scientific study of earthquakes and propagation of elastic waves through a planet | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 878 |  | Selenium | Chemical element with atomic number 34 (Se) | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 879 | Semiconductor | Material of moderate electrical conductivity | Physical sciences | +0 / -0 / 0 | 0.500000 | |
| 880 |  | Seyfert galaxy | Class of active galaxies with very bright nuclei | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 881 |  | Shrubland | Vegetation dominated by shrubs | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 882 | Siemens (unit) | SI unit of electric conductance | Physical sciences | +0 / -0 / 0 | 0.500000 | |
| 883 |  | Sievert | Derived SI unit of equivalent dose of ionizing radiation | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 884 |  | Silicate | Any polyatomic anion containing silicon and oxygen | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 885 |  | Silicon | Chemical element with atomic number 14 (Si) | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 886 |  | Silicone | Family of polymers | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 887 |  | Silver | Chemical element with atomic number 47 (Ag) | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 888 |  | Simple harmonic motion | To-and-fro periodic motion in science and engineering | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 889 |  | Sirius | Brightest star in Earth's night sky | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 890 |  | Sky | Unobstructed view upward from Earth | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 891 |  | Small Magellanic Cloud | Dwarf irregular galaxy, satellite galaxy of the Milky Way | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 892 |  | Sodium | Chemical element with atomic number 11 (Na) | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 893 |  | Sodium bicarbonate | Chemical compound | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 894 |  | Sodium carbonate | Chemical compound | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 895 |  | Sodium chloride | Chemical compound with formula NaCl | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 896 |  | Sodium nitrate | Chemical compound | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 897 | Sodium silicate | Hygroscopic chemical compound of variable Na2O/SiO2 ratio precursor of waterglass | Physical sciences | +0 / -0 / 0 | 0.500000 | |
| 898 |  | Sodium sulfate | Chemical compound with formula Na2SO4 | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 899 |  | Soil | Earth, a natural material | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 900 |  | Soil fertility | Ability of a soil to sustain agricultural plant growth | Physical sciences | +0 / -0 / 0 | 0.500000 |
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