Can you imagine a color you've never seen?" Jeffrey Tibbetts asks, looking directly into the Skype camera. We would like to think that we can, of course, that our imaginations are limitless. But the answer, no matter how much we skirt around it, is actually "no." However, Tibbetts insists that he himself can see another color. He, along with several friends, is part of a homegrown experiment where he has attempted to alter his vision to see in the infrared, which humans can't usually see. The three experimenters have just completed a 25-day nutritional regimen and, as their bodies return to normal, they will continue to document their vision for the next two weeks. Very early results appear promising, albeit incomplete. But several experts in ophthalmology have doubts about the purpose and safety of the project, not to mention the validity of the results themselves.
People who want to improve how humans function span the full range of invasiveness, from gym rats who chug protein shakes to biohobbyists slicing open their flesh in basements.