The eye on the wall spots the selfish gene. A simple experiment in a typical office kitchen takes us inside the human mind, writes Ian Sample. HONESTY may well be the best policy, but it often deserts us when no one is watching, psychologists say. Experiments...

There are basically two type of sunless tanning, those on the outside and those from the inside. OUTSIDE - BRONZERS and TANNING LOTIONS/SPRAYS:Bronzers are cosmetic and stay on until they wash off. Tanning lotions contain DHA - dihydroxyzcetone. Its a colorless lotion that has a way of changing the outer layer of cells to a darker pigment, it lasts about 5-7 days. INSIDE - TANNING PILLS/TANNING ACCELERATORS:Tanning Pills contain canthaxanthin. This is the same ingredient used in food coloring.