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Suntan produced by solar energy forms a reddish-brown colour, while that from
artificial sources is more yellowish-tan; suntans may remain for several months
after the exposure to ultraviolet. The degree of pigmentation is directly related to ...
The body's ability to accept vibrational stress depends in part on the length of
exposure. Vibrations with frequencies of less than two cycles per second are
encountered mainly in low-altitude aircraft. Motion sickness, dizziness, nausea,
Grant administration exposure 8:279f whisk fern, common name for members of
two plant families, Psilotaceae and Tmesipteridaceae, which form the order
Psilotales. Each family contains one genus. The plants are the only living
members of ...
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This is the 198215th Edition, in two halves, with the Macropaedia and the Micropaedia. First published in 1768, the publisher is the oldest English-language encyclopedia still in print. Two Scottish ... Read full review