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 .
Harmful influence of technology Harmful influence of technology Harmful influence of technology refers to the negative effect of technology which comes along with all of the useful implementations of variety of devices and innovations. People are constantly exposed to waves and radiation emitted from various appliances that are in everyday use. The rapid increase of the number of users of the mobile phones started in the last twenty years of the 20th century, and now multi-functionality of smartphones attract more and more users all around the world according to the Das S, Chakraborty S and Mahanta B. in "A study on the effect of