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Inuit snow goggles function by reducing exposure to sunlight, not by reducing its intensity. Since the 13th century and until the spread of contemporary UV-shielding spectacles against snowblindness, Inuit made and wore snow goggles of flattened walrus or caribou ivory with narrow slits to look through to block almost all of the harmful reflected rays of the sun.
The High Resolution Fly's Eye or HiRes detector was an ultra-high-energy cosmic ray observatory that operated in the West Desert of Utah from May 1997 until April 2006. . HiRes (HiRes-I, HiRes-II, and HiRes prototype) used the "atmospheric fluorescence" technique that was pioneered by the Utah group first in tests at the Volcano Ranch experiment and then with the original Fly's Eye exper
This article lists songs and whole discographies which have been banned by the BBC (British Broadcasting Corporation) over the years. During its history, the corporation has banned songs from a number of high-profile artists, including Cliff Richard, Frank Sinatra, Noël Coward, the Beatles, Ken Dodd, Elvis Presley, Bing Crosby, the BBC Dance Orchestra, Tom Lehrer, Glenn Miller, and George Formby.
The Eye of Providence can be found on the reverse of the Great Seal of the United States, as seen on the U.S. $1 bill, depicted here.. The Eye of Providence or All-Seeing Eye is a symbol depicting an eye, often enclosed in a triangle and surrounded by a ray of light or a halo, intended to represent Providence, as the eye watches over the workers of mankind.
Gamma-ray sensors are also used for measuring the fluid levels in water and oil industries. [17] Typically, these use Co-60 or Cs-137 isotopes as the radiation source. In the US, gamma ray detectors are beginning to be used as part of the Container Security Initiative (CSI). These machines are advertised to be able to scan 30 containers per hour.
Most countries outside of the continental US, especially Europe, use a different style of fire helmet which covers more of the head, including the ears, and will sometimes have a nape protector at the back. This style is often referred to as a "Euro" style helmet, and most are fitted with a full face visor, eye protection, and a light.
Photokeratitis can be prevented by using sunglasses or eye protection that transmits 5–10% of visible light and absorbs almost all UV rays. Additionally, these glasses should have large lenses and side shields to avoid incidental light exposure. Sunglasses should always be worn, even when the sky is overcast, as UV rays can pass through ...
Light, visible light, or visible radiation is electromagnetic radiation that can be perceived by the human eye. [1] Visible light spans the visible spectrum and is usually defined as having wavelengths in the range of 400–700 nanometres (nm), corresponding to frequencies of 750–420 terahertz .
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