Cold refers to the condition or subjective perception of having low temperature. A cold body is often described as the opposite of hot, or as having less heat, although the latter use of "heat" would be incorrect in the context of physics, as heat refers to the transfer of energy between bodies, which do not "have" heat themselves.

A lower bound to temperature is the absolute zero, defined as 0 K on the Kelvin scale, an absolute thermodynamic temperature scale. This corresponds to −273.15 °C on the Celsius scale, −459.67 °F on the Fahrenheit scale, and 0 °R on the Rankine scale.

Since temperature relates to the thermal energy held by an object or a sample of matter, which is the kinetic energy of the random motion of the particle constituents of matter, an object will have less thermal energy when it is colder and more when it is hotter. If it were possible to cool a system to absolute zero, all motion of the particles in a sample of matter would cease and they would be at complete rest in this classical sense. The object would be described as having zero thermal energy. Microscopically in the description of quantum mechanics, however, matter still has zero-point energy even at absolute zero, because of the uncertainty principle.

Open may refer to:

Saturday Night Live (abbreviated as SNL) is an American late-night live television sketch comedy and variety show created by Lorne Michaels and developed by Dick Ebersol. The show premiered on NBC on October 11, 1975, under the original title of NBC's Saturday Night. The show revolves around a series of sketches parodying American culture and politics, performed by a large and varying cast of repertory and newer cast members. Each episode is hosted by a celebrity guest who delivers an opening monologue and takes part in sketches with the cast, and features a musical guest who also performs. SNL normally begins with a cold open sketch that ends with someone breaking character and proclaiming, "Live from New York, it's Saturday Night!", beginning the show proper.

Michaels left the series in 1980 to explore other opportunities, and he was replaced by Jean Doumanian who led the show to disastrous reviews and was replaced by Ebersol after one season. Ebersol continued to run the show until 1985, when Michaels returned and where he has remained since. Many of SNL's cast found national stardom while appearing on the show and achieved success in film and television, both in front of and behind the camera. In particular, SNL has helped launch the careers of Dan Aykroyd, John Belushi, Chevy Chase, Jimmy Fallon, Will Ferrell, Tina Fey, Eddie Murphy, Bill Murray, Mike Myers, and Adam Sandler. Additionally others associated with the show such as writers have gone on to successful careers, including Conan O'Brien, Max Brooks, Stephen Colbert, Larry David, Al Franken, Sarah Silverman, and Robert Smigel.