On Tue, Dec 12, 2006 at 10:29:13AM -0500, Mark Roberts wrote: > Cory Papenfuss wrote: > > Trivia: Approximately 1% of women have tetrachromatic color vision - > that is, four different types of cone cells in their retinas - and can > see a vastly broader gamut than normal people. Exactly 0% of men have > this ability; you need two X chromasomes to get it.
Careful with that "exactly 0%" - I believe XXY usually presents as male. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net
