Most people know about the strange smell that asparagus gives off after it has been, ahem, processed by some humans. Yet other humans aren’t able to smell the odor at all. That makes asparagus an unusual marker for the intricacies of genetic variation.
Anosmia, the inability to smell, isn't as well-known as blindness or deafness, but it still affects an estimated two million people in the US. A new breakthrough has cured anosmia in mice... and the human impact could be far greater.