Sun tanning However, it operates not by inducing direct DNA damage, but by producing reactive oxygen species which damage DNA indirectly. UVA (see above) induces a cosmetic tan but little extra melanin protection against sun damage, sun burn, or cancer. Ultraviolet B (UVB) radiation is in the wavelength range 280 to 320 nm. Much of this band is blocked by the Earth's ozone layer, but some penetrates. UVB: A person's natural skin color affects their reaction to exposure to the sun. An individual's natural skin color can vary from a dark brown to a nearly colorless pigmentation, which may appear white .
Out of Gas: The End of the Age of Oil Out of Gas: The End of the Age of Oil Out of Gas: The End of the Age of Oil is a 2004 book written by David Goodstein. It describes peak oil and the future of civilization. The book gives the scientific view that the age of petroleum is coming to an end, and the future is dangerously insecure. Oil demand will shortly exceed the production capacity of even the largest suppliers. The book describes how the world economy is moving towards an uneasy transition. In this book, Goodstein rejected the notion that after peak occurs new alternative sources of