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Describes how the sound and pictures from a live event get from the camera to the home television screen. Provides a history of television, explaining the switch from black and white to color. Notes the advantages of digital signals over analog. Considers the future of television. Looks at a new technique, digital video compression, in which television signals are received through phone lines.
(Source: DCMP)
Uses the fascinating setting of a circus to provide the analogy for growth. A magician creating the illusion of multiplying balls introduces microphotography, showing how cells divide and multiply. Shows how bones are continually being built and destroyed and, in a spectacular sequence of time-lapse photography, actually captures a tooth growing-from the moment it first appears out of the gum until it falls out.
What happens to the body during sleep? Explores the mystery of REM sleep, shows a computer display of the waves that sweep across the brain during sleep, and presents extraordinary footage of a cat "acting out" its dreams. The analogy of comparing sleep to a ship on automatic pilot graphically illustrates how some functions must and do continue while the conscious brain is asleep.
A mutagen is any agent (physical, chemical, or biological) capable of altering the structure of DNA within human cells. This program explores how some mutations are a natural process resulting from errors in the copying and repair of DNA and how some mutagens naturally exist in the world (e.g., UV radiation, cosmic rays, and some radioactive isotopes). Others are specific chemicals that have been synthesized for use in manufacturing or other industries. Mutagens may also arise during the metabolism of certain foods. In many cases mutagens may also lead to the development of cancers.
The world’s largest scientific archive of animal signal recordings is housed at the Macaulay Library. The library is partnering with other institutions to curate and digitize an enormous archive of animal audio and video recordings from their vaults. The analogue material in the library’s collection includes recordings of birds, frogs, fish, and insects going back a few decades. Accessible digital audio recordings of these animal signals will make it easier for researchers to investigate a host of scientific questions. Part of the "Science Nation" series.
