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10,033 things · 1,902 votes cast · cast a vote
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| # | Thing | Description | Topic | Up/Down/Net | Score ▼ | |
|---|---|---|---|---|---|---|
| 401 |  | Lawn mower | Grass-cutting device | Technology | +0 / -0 / 0 | 0.500000 |
| 402 | Leap year | Calendar year with a day (or month) added | Technology | +0 / -0 / 0 | 0.500000 | |
| 403 |  | Leather | Durable and flexible material created by tanning animal skins | Technology | +0 / -0 / 0 | 0.500000 |
| 404 |  | Lens | Optical device which transmits and refracts light | Technology | +0 / -0 / 0 | 0.500000 |
| 405 |  | Levee | Ridge or wall to hold back water | Technology | +0 / -0 / 0 | 0.500000 |
| 406 |  | Lever | Simple machine consisting of a beam pivoted at a fixed hinge | Technology | +0 / -0 / 0 | 0.500000 |
| 407 |  | Light-emitting diode | Semiconductor light source | Technology | +0 / -0 / 0 | 0.500000 |
| 408 |  | Lighthouse | Structure designed to emit light to aid navigation | Technology | +0 / -0 / 0 | 0.500000 |
| 409 |  | Lighting | Deliberate use of light to achieve practical or aesthetic effects | Technology | +0 / -0 / 0 | 0.500000 |
| 410 |  | Linen | Textile made from spun flax fibre | Technology | +0 / -0 / 0 | 0.500000 |
| 411 |  | Liquid-crystal display | Display that uses the light-modulating properties of liquid crystals | Technology | +0 / -0 / 0 | 0.500000 |
| 412 |  | Livestock | Animals kept to produce material goods | Technology | +0 / -0 / 0 | 0.500000 |
| 413 |  | Lock (water navigation) | Device for raising and lowering boats or ships | Technology | +0 / -0 / 0 | 0.500000 |
| 414 |  | Lock and key | Mechanical or electronic fastening device | Technology | +0 / -0 / 0 | 0.500000 |
| 415 |  | Locomotive | Self-propelled railway vehicle | Technology | +0 / -0 / 0 | 0.500000 |
| 416 |  | London Underground | Rapid transit system in England | Technology | +0 / -0 / 0 | 0.500000 |
| 417 |  | Loom | Device for weaving textiles | Technology | +0 / -0 / 0 | 0.500000 |
| 418 |  | Loudspeaker | Converts an electrical audio signal into a corresponding sound | Technology | +0 / -0 / 0 | 0.500000 |
| 419 |  | Lumber | Wood that has been processed into beams and planks | Technology | +0 / -0 / 0 | 0.500000 |
| 420 |  | MS-DOS | Microsoft computer operating system | Technology | +0 / -0 / 0 | 0.500000 |
| 421 |  | Machete | Type of broad and heavy knife | Technology | +0 / -0 / 0 | 0.500000 |
| 422 |  | Machine | Powered mechanical device | Technology | +0 / -0 / 0 | 0.500000 |
| 423 |  | Machine gun | Fully automatic firearm | Technology | +0 / -0 / 0 | 0.500000 |
| 424 | Machine learning | Subset of artificial intelligence | Technology | +0 / -0 / 0 | 0.500000 | |
| 425 |  | Machine press | Machine tool that changes the shape of a work piece by the application of pressure | Technology | +0 / -0 / 0 | 0.500000 |
| 426 |  | Magnetic tape | Data recording made of plastic film | Technology | +0 / -0 / 0 | 0.500000 |
| 427 |  | Maritime transport | Transport of people or goods via waterways | Technology | +0 / -0 / 0 | 0.500000 |
| 428 |  | Masonry | Building of structures from individual units of stone, bricks, or blocks | Technology | +0 / -0 / 0 | 0.500000 |
| 429 |  | Mass production | High volume production of standardized products | Technology | +0 / -0 / 0 | 0.500000 |
| 430 |  | Maunakea Observatories | Astronomical observatories in Hawaii | Technology | +0 / -0 / 0 | 0.500000 |
| 431 |  | Mechanical engineering | Engineering discipline | Technology | +0 / -0 / 0 | 0.500000 |
| 432 |  | Mechanization | Process of changing from working by hand or with animals to work with machinery | Technology | +0 / -0 / 0 | 0.500000 |
| 433 |  | Medical imaging | Technique and process of creating visual representations of the interior of a body | Technology | +0 / -0 / 0 | 0.500000 |
| 434 |  | Medical ultrasound | Medical intervention | Technology | +0 / -0 / 0 | 0.500000 |
| 435 |  | Memory card | Electronic data storage device | Technology | +0 / -0 / 0 | 0.500000 |
| 436 |  | Merchant ship | Civilian boat or ship that transports cargo or carries passengers for hire | Technology | +0 / -0 / 0 | 0.500000 |
| 437 |  | Metallurgy | Field of science that studies the physical and chemical behavior of metals | Technology | +0 / -0 / 0 | 0.500000 |
| 438 |  | Metalworking | Process of making items from metal | Technology | +0 / -0 / 0 | 0.500000 |
| 439 |  | Microscope | Scientific instrument for observing small objects | Technology | +0 / -0 / 0 | 0.500000 |
| 440 |  | Microwave oven | Kitchen cooking appliance | Technology | +0 / -0 / 0 | 0.500000 |
| 441 |  | Military engineering | Building and maintaining structures and systems for armies | Technology | +0 / -0 / 0 | 0.500000 |
| 442 |  | Military technology | Application of technology for use in warfare | Technology | +0 / -0 / 0 | 0.500000 |
| 443 |  | Mirror | Object that reflects an image | Technology | +0 / -0 / 0 | 0.500000 |
| 444 |  | Missile | Self-propelled guided weapon system | Technology | +0 / -0 / 0 | 0.500000 |
| 445 |  | Moat | Defensive ditch surrounding a fortification or town | Technology | +0 / -0 / 0 | 0.500000 |
| 446 |  | Mobile device | Small, handheld computing device | Technology | +0 / -0 / 0 | 0.500000 |
| 447 |  | Mobile phone | Portable device to make telephone calls using a radio link | Technology | +0 / -0 / 0 | 0.500000 |
| 448 |  | Modelling clay | Any of a group of malleable substances used in building and sculpting | Technology | +0 / -0 / 0 | 0.500000 |
| 449 |  | Monorail | Railway with a single rail or beam | Technology | +0 / -0 / 0 | 0.500000 |
| 450 |  | Motorcycle | Two- or three-wheeled motor vehicle | Technology | +0 / -0 / 0 | 0.500000 |
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