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10,033 things · 1,902 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 ▼ | |
|---|---|---|---|---|---|---|
| 401 |  | Europa (moon) | Smallest Galilean moon of Jupiter | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 402 |  | Europium | Chemical element with atomic number 63 (Eu) | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 403 |  | Event horizon | Region in spacetime from which nothing can escape | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 404 |  | Exoplanet | Planet outside of the Solar System | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 405 |  | Experiment | Scientific procedure performed to validate a hypothesis | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 406 |  | Explosion | Sudden release of heat and gas | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 407 |  | Extinction (astronomy) | Interstellar absorption and scattering of light | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 408 |  | Extinction event | Rapid decrease in Earth's biodiversity | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 409 | Extraterrestrial life | Life that does not originate on Earth | Physical sciences | +0 / -0 / 0 | 0.500000 | |
| 410 |  | Fahrenheit | Temperature scale | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 411 |  | Farad | SI unit of electric capacitance | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 412 |  | Fatigue (material) | Initiation and propagation of cracks in a material due to cyclic loading | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 413 |  | Fault (geology) | Fracture or discontinuity in displaced rock | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 414 |  | Feldspar | Group of rock-forming minerals | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 415 |  | Fermion | Type of subatomic particle | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 416 |  | Field (physics) | Physical quantities taking values at each point in space and time | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 417 |  | Field research | Collection of information outside a laboratory, library or workplace setting | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 418 |  | Filtration | Process that separates solids from fluids | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 419 |  | Flood | Water overflow submerging usually-dry land | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 420 |  | Floodplain | Land adjacent to a water body which is flooded during periods of high water | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 421 |  | Fluid dynamics | Aspects of fluid mechanics involving fluid flow | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 422 | Fluid mechanics | Branch of physics | Physical sciences | +0 / -0 / 0 | 0.500000 | |
| 423 |  | Fluorescence | Emission of light by a substance that has absorbed light | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 424 |  | Fluorine | Chemical element with atomic number 9 (F) | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 425 | Flux | Mathematical concept applicable to physics | Physical sciences | +0 / -0 / 0 | 0.500000 | |
| 426 |  | Foam | Form of matter | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 427 |  | Focus (optics) | Point at which light rays converge | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 428 |  | Fog | Atmospheric phenomenon | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 429 |  | Fold (geology) | Stack of originally planar surfaces | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 430 | Foot (unit) | Customary unit of length | Physical sciences | +0 / -0 / 0 | 0.500000 | |
| 431 |  | Force | Influence that can change motion of an object | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 432 |  | Forest | Dense collection of trees covering a relatively large area | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 433 |  | Formaldehyde | Organic compound (H–CHO); simplest aldehyde | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 434 |  | Formation and evolution of the Solar System | Physical sciences | +0 / -0 / 0 | 0.500000 | |
| 435 | Frame of reference | Abstract coordinate system | Physical sciences | +0 / -0 / 0 | 0.500000 | |
| 436 | Francium | Chemical element with atomic number 87 (Fr) | Physical sciences | +0 / -0 / 0 | 0.500000 | |
| 437 |  | Freezing | Phase transition of liquid to solid | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 438 |  | Friction | Force resisting sliding motion | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 439 | Fundamental interaction | Most basic type of physical force | Physical sciences | +0 / -0 / 0 | 0.500000 | |
| 440 |  | Gadolinium | Chemical element with atomic number 64 (Gd) | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 441 |  | Gain (electronics) | Ability of a circuit to increase the power or amplitude of a signal | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 442 |  | Galactic Center | Rotational center of the Milky Way galaxy | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 443 |  | Galaxy | System of stars and interstellar matter | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 444 |  | Galaxy formation and evolution | Subfield of cosmology | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 445 |  | Galaxy groups and clusters | Largest known gravitationally bound object in universe; aggregation of galaxies | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 446 |  | Galaxy morphological classification | System for categorizing galaxies based on appearance | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 447 |  | Gallium | Chemical element with atomic number 31 (Ga) | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 448 |  | Gallon | Units of volume | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 449 |  | Gamma ray | Penetrating form of electromagnetic radiation | Physical sciences | +0 / -0 / 0 | 0.500000 |
| 450 |  | Ganymede (moon) | Largest moon of Jupiter | Physical sciences | +0 / -0 / 0 | 0.500000 |
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