Hank delves into the scientific reasons behind why we are attracted to the people we're attracted to. It's complicated.

Hank delves into the scientific reasons behind why we are attracted to the people we're attracted to. It's complicated.

Many seahorse species have males with full-blown pregnancies. But in order to do this, their immune system is missing something kind of important.

The Major Histocompatibility Complex (MHC) is a tightly linked gene cluster encoding cell surface molecules essential for antigen presentation and tissue graft rejection, known as histocompatibility antigens. In humans (HLA complex on...