"Not all chemicals are bad. Without chemicals such as hydrogen and oxygen,...
Adam Hatcher s
http://pinterest.com/manishkhurana/ There are known knowns - things we know that we know; there are known unknowns - things we know that we don't know; there are also unknown unknowns - things we don't know we don't know! Here on StumbleUpon for my unknown unknowns!">Amateur guitarist, art and food lover. http://pinterest.com/manishkhurana/...