All articles starting with S
44,216 articles
Speed breeding
Speed breeding is a plant breeding method that uses extended photoperiods and controlled light and temperature to compress crop generation cycles, reaching up to 6 generations per year in wheat.
Speed bump
A speed bump, also called a sleeping policeman, is a raised ridge across a road that forces vehicles to slow down, typically used in parking lots.
Speed camera
A speed camera is an automated traffic enforcement device that photographs the license plate of a speeding vehicle, and the owner or driver is sent a ticket.
Speed dating
Speed dating: organized brief one-on-one dating encounters with mutual-yes matching, created in 1998 Los Angeles by Rabbi Yaacov Deyo for Jewish singles, and widely used as a research paradigm for initial romantic attraction.
Speed Demon (2026 film)
Speed Demon (2026) is an American horror film directed by Jon Keeyes, written by Domenico Salvaggio, starring Katie Cassidy as Sister Lu and William H. Macy as Father Novak, about a demon-possession exorcism on a runaway Montreal-to-New York train; released May 31, 2026, distinct from the Michael Jackson song and the Scourge RPG buff.
Speed Demon (Justin Bieber song)
Speed Demon (Justin Bieber song): opening track of SWAG II, released September 5, 2025; funk-influenced rap-sung kiss-off reusing the "is it clocking to you" meme, produced by Carter Lang, Eddie Benjamin, Dylan Wiggins, and Daniel Chetrit.
Speed dial
Speed dial is a telephone feature that calls a stored number by pressing one or two digits or a dedicated button instead of dialing it fully.
Speed Freak Killers
Speed Freak Killers: Wesley Shermantine and Loren Herzog, meth-fueled serial killer duo of San Joaquin County, California, 1980s-1990s; convicted of four murders, suspected of up to 72; Herzog died by suicide in 2012, Shermantine died in prison in 2026.
Speed Graphic
The Speed Graphic was a Graflex folding press camera produced from 1912 to 1973, the standard camera of American photojournalism from the 1930s through the 1950s.
Speed harmonization
Speed harmonization is an active traffic management strategy that gradually lowers and coordinates vehicle speeds upstream of congested freeway bottlenecks, reducing stop-and-go traffic and delaying flow breakdown.
Speed hump
A speed hump, also called a road hump, is a raised, gently curved pavement area on residential streets that forces drivers to slow to about 15 to 20 mph.
Speed Index (web performance)
Speed Index is a web performance metric that measures how quickly a page's contents are visibly populated during load, expressed in milliseconds, with lower scores better.
Speed limit
A speed limit is a legal maximum, and sometimes a minimum, for vehicle speed on a road, set by a government and enforced through traffic law.
Speed limiter
A speed limiter is a device or software function that prevents a vehicle from exceeding a preset maximum speed, typically by restricting fuel supply to the engine.
Speed limits by country
Speed limits by country compares legal maximum road speeds worldwide: typical urban defaults of 50 km/h, motorway limits of 120 to 130 km/h, and Germany's Autobahn with no general limit.
Speed limits in Germany
Speed limits in Germany, set by road type and signs, are 50 km/h in built-up areas and 100 km/h rural, while autobahns carry only an advisory 130 km/h.
Speed limits in the United States
Speed limits in the United States are maximum vehicle speeds set by individual states through state law or engineering studies, including Texas's 85 mph maximum.
Speed metal
Speed metal: fast-tempo subgenre of heavy metal from the late 1970s and early 1980s, built on NWOBHM and Motörhead, codified by "Exciter" and "Fast as a Shark," ancestor of thrash and power metal.
Speed of electricity
Speed of electricity, or velocity of electricity, is how fast an electrical signal propagates along a conductor, roughly 10⁸ m/s, while electrons themselves drift at about 10⁻⁴ m/s.
Speed of gravity
The speed of gravity is the speed at which gravitational changes propagate. General relativity requires it to equal the speed of light, confirmed by 2017 measurements.
Speed of light
The speed of light in vacuum, denoted c, is exactly 299,792,458 meters per second, fixed by definition in 1983, when the meter was redefined in terms of it.
Speed of sound
The speed of sound, or sound velocity, is the rate a pressure disturbance travels through a medium, about 343 m/s in air at sea level and 5,960 m/s in steel.
Speed of sound in neutron-star matter
The speed of sound in neutron-star matter measures how fast pressure disturbances travel through a neutron star's interior, probing the equation of state that sets its maximum mass.
Speed Racer
Speed Racer, originally マッハGoGoGo (Mach GoGoGo), is Tatsunoko Production's 1967 racing anime by Tatsuo Yoshida: 52 Fuji TV episodes, the gadget-button Mach Five, Peter Fernandez's US dub, and the 2008 Wachowski film.
Speed Racer (マッハGoGoGo) (film)
Speed Racer (Japanese: マッハGoGoGo, Mach GoGoGo) is a 2008 American racing film written and directed by the Wachowskis, starring Emile Hirsch and based on the 1967 anime series.
Speed reading
Speed reading: techniques and courses claiming to read far faster without comprehension loss. Key figures: Evelyn Wood's Reading Dynamics, RSVP apps like Spritz. Research caps skilled reading at 200-400 wpm; over 1,000 wpm costs comprehension.
Speed skating
Speed skating: racing on ice over set distances, governed by the ISU (founded 1892) and split into long track (400 m oval, pairs against the clock) and short track. Olympic since 1924; Netherlands leads with 146 medals.
Speed skating at the 2006 Winter Olympics – Men's 500 metres
Men's 500 m long track speed skating, Torino 2006 Olympics, 13 February, Oval Lingotto. Joey Cheek (USA) won gold in 1:09.76 total over two races; Dorofeyev (RUS) silver, Lee Gang-Seok (KOR) bronze.
Speed skating at the 2010 Winter Olympics – Men's 500 metres
Men's 500 m long track speed skating, Vancouver 2010 Olympics, 15 February 2010, Richmond Olympic Oval; Mo Tae-Beom (South Korea) won gold in 1:09.82 over two runs, ahead of Nagashima and Kato of Japan.
Speed skating at the 2014 Winter Olympics – Men's 10,000 metres
Men's 10,000 m long track speed skating, Sochi 2014 Olympics, 18 February at Adler Arena. Jorrit Bergsma won in 12:44.45, an Olympic and lowland world record, leading a record fourth all-Dutch podium sweep over Sven Kramer and Bob de Jong.