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 .
The Screens The Screens The Screens () is a play by the French dramatist Jean Genet. Its first few productions all used abridged versions, beginning with its world premiere under Hans Lietzau's direction in Berlin in May 1961. Its first complete performance was staged in Stockholm in 1964, two years before Roger Blin directed its French premiere in Paris. Genet began writing the play in 1955 and continued to develop it over the following few years, completing a first version in June 1958. He re-wrote the play further while in Greece towards the end of 1959. Marc Barbezat's publishing company L'Arbalète published