Leaderboard
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 ▼ | |
|---|---|---|---|---|---|---|
| 501 |  | Polarizer | Optical filter device | Technology | +0 / -0 / 0 | 0.500000 |
| 502 |  | Port | Maritime facility where ships may dock to load and discharge passengers and cargo | Technology | +0 / -0 / 0 | 0.500000 |
| 503 |  | Postage stamp | Piece of paper which shows payment for postage | Technology | +0 / -0 / 0 | 0.500000 |
| 504 |  | Potter's wheel | Machine used in the shaping of round ceramic ware | Technology | +0 / -0 / 0 | 0.500000 |
| 505 |  | Pottery | Craft of making objects from clay | Technology | +0 / -0 / 0 | 0.500000 |
| 506 |  | Printed circuit board | Board to support and connect electronic components | Technology | +0 / -0 / 0 | 0.500000 |
| 507 |  | Printer (computing) | Computer peripheral that prints text or graphics | Technology | +0 / -0 / 0 | 0.500000 |
| 508 |  | Printing | Process for reproducing text and images | Technology | +0 / -0 / 0 | 0.500000 |
| 509 |  | Printing press | Machine for applying ink under pressure | Technology | +0 / -0 / 0 | 0.500000 |
| 510 |  | Prism (optics) | Transparent optical element with flat, polished surfaces that refract light | Technology | +0 / -0 / 0 | 0.500000 |
| 511 |  | Programming language | Language for controlling a computer | Technology | +0 / -0 / 0 | 0.500000 |
| 512 |  | Prosthesis | Artificial device that replaces a missing body part | Technology | +0 / -0 / 0 | 0.500000 |
| 513 |  | Public transport | Shared transportation service for use by the general public | Technology | +0 / -0 / 0 | 0.500000 |
| 514 |  | Pulley | Wheel to support movement and change of direction of a taut cable | Technology | +0 / -0 / 0 | 0.500000 |
| 515 |  | Pumping station | Facilities including pumps and equipment for pumping fluids from one place to another | Technology | +0 / -0 / 0 | 0.500000 |
| 516 |  | Pyramid | Structure shaped as a geometric pyramid | Technology | +0 / -0 / 0 | 0.500000 |
| 517 |  | Qanat | Water supply system developed in ancient Iran | Technology | +0 / -0 / 0 | 0.500000 |
| 518 |  | Radar | Object detection system using radio waves | Technology | +0 / -0 / 0 | 0.500000 |
| 519 |  | Radio | Use of radio waves for communication | Technology | +0 / -0 / 0 | 0.500000 |
| 520 |  | Radio broadcasting | Transmission of radio waves intended to reach a wide audience | Technology | +0 / -0 / 0 | 0.500000 |
| 521 |  | Radio telescope | Directional radio antenna used in radio astronomy | Technology | +0 / -0 / 0 | 0.500000 |
| 522 |  | Radiography | Imaging technique using radiation | Technology | +0 / -0 / 0 | 0.500000 |
| 523 |  | Rake (tool) | Agricultural tool used for moving soil | Technology | +0 / -0 / 0 | 0.500000 |
| 524 |  | Random-access memory | Form of computer memory | Technology | +0 / -0 / 0 | 0.500000 |
| 525 |  | Rapid transit | High-capacity public transport | Technology | +0 / -0 / 0 | 0.500000 |
| 526 |  | Rapier | One-handed thrusting sword | Technology | +0 / -0 / 0 | 0.500000 |
| 527 |  | Recycling | Converting waste materials into new products | Technology | +0 / -0 / 0 | 0.500000 |
| 528 |  | Refrigeration | Process of moving heat from one location to another in controlled conditions | Technology | +0 / -0 / 0 | 0.500000 |
| 529 |  | Refrigerator | Appliance for cold food storage | Technology | +0 / -0 / 0 | 0.500000 |
| 530 |  | Relay | Electrically operated switch | Technology | +0 / -0 / 0 | 0.500000 |
| 531 |  | Remote control | Device used to control other devices remotely | Technology | +0 / -0 / 0 | 0.500000 |
| 532 |  | Resistor | Passive electronic component providing electrical resistance | Technology | +0 / -0 / 0 | 0.500000 |
| 533 |  | Rickshaw | Two- or three-wheeled passenger cart | Technology | +0 / -0 / 0 | 0.500000 |
| 534 |  | Rifle | Common long range firearm | Technology | +0 / -0 / 0 | 0.500000 |
| 535 |  | Rivet | Permanent mechanical fastener | Technology | +0 / -0 / 0 | 0.500000 |
| 536 |  | Road | Land route | Technology | +0 / -0 / 0 | 0.500000 |
| 537 |  | Road transport | Collective term for all forms of transport which takes place on roads | Technology | +0 / -0 / 0 | 0.500000 |
| 538 |  | Robot | Machine capable of carrying out a complex series of actions automatically | Technology | +0 / -0 / 0 | 0.500000 |
| 539 |  | Robotics | Design, construction, use, and application of robots | Technology | +0 / -0 / 0 | 0.500000 |
| 540 |  | Rocket | Vehicle propelled by ejection of gases | Technology | +0 / -0 / 0 | 0.500000 |
| 541 |  | Rocket engine | Non-airbreathing engine used to propel a missile or vehicle | Technology | +0 / -0 / 0 | 0.500000 |
| 542 |  | Roof | Top covering of a building | Technology | +0 / -0 / 0 | 0.500000 |
| 543 |  | Room | Distinguishable space within a building or other structure | Technology | +0 / -0 / 0 | 0.500000 |
| 544 |  | Roscosmos | Space agency of Russia | Technology | +0 / -0 / 0 | 0.500000 |
| 545 |  | Router (computing) | Device that forwards data packets between computer networks | Technology | +0 / -0 / 0 | 0.500000 |
| 546 |  | Ruler | Instrument used to measure distances | Technology | +0 / -0 / 0 | 0.500000 |
| 547 |  | Saddle | Supportive structure for a rider or load | Technology | +0 / -0 / 0 | 0.500000 |
| 548 |  | Sail | Fabric or other surface supported by a mast to allow wind propulsion | Technology | +0 / -0 / 0 | 0.500000 |
| 549 |  | Sailing ship | Large wind-powered water vessel | Technology | +0 / -0 / 0 | 0.500000 |
| 550 |  | Sanitary sewer | Underground pipe for transporting sewage | Technology | +0 / -0 / 0 | 0.500000 |
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