John Swierk is an assistant professor of chemistry at Binghamton University, State University of New York. Tattoos are an incredibly common form of permanent self-expression that date back thousands ...

Today’s youth are more colorful than their parents, at least when it comes to permanent body art. Once considered taboo in mainstream cultures in the US and Europe, tattoos are more accepted socially ...

From minimalist wrist designs to full sleeves, body art has become so common that it barely raises an eyebrow. But while the personal meaning of a tattoo may be obvious, the biological consequences ...