Why do I often have blue feet?

Stephen J. Gould wrote a book called The Flamingo's Smile that explained (among other things) why flamingoes eat the way they do and have the color that they have: it's due to the shrimp that they eat. Wikipedia explains that the blue of the blue-footed...

I am noticing her hands are often pupley/blue lately I asked my DR at our last visit this past week he said this was normal is it really they are cold to touch but no other signs of distress and it goes away other times her hands are boiling hot. Did...

I recently read/heard this somewhere, but I can't remember the exact details... I think it has something to do with something "acting" as a guillotine, possibly some kind of safety device? Apparently for years, people wondered why when recovering...

If I am running my toes/feet will go numb after a while. I thought it might be my shoes but I have new shoes and the same problem. Sometimes I do yoga and when I am holding a pose my hands/feet will sometimes begin to tingle.

ok so i am cold last night i went to six flags and i went to a water ride at night i didn't had a towl and know my big toe is sleepy and im cold and my feet are blue help im scared im only 12 could it be a sickness i dont want to go to a doctor should...

Some parts are still blue, but most of its feet have turned pink.

for about the last 4 months when I am cold or have been leaning on my arms my hads and feet go a very deep blue/purple. Is it worth mentioning it to my doctor?

I have noticed that alot of people seem to have hairly legs but then the hair seems to stop around the ankles. Is this an evolutionary thing in that because we where shoes we no longer need hair on our feet I am also aware of how long eviolution takes...

My sister who is 12 does it and I wondered what the reason is, is it some habit that kids and teens do or something. My friend who is 13 does it also, when im at his house he grabs his barefoot and fiddles with his toes. Thanks for your input btw im...