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Redheads Need More Anesthesia than Others
Natural redheads need 20% more anesthesia than other people report scientists. "Redheads are likely to experience more pain from a given stimulus and therefore require more anesthesia to alleviate that pain." said Dr. Edwin Liem of the University of Louisville in Kentucky. Anesthesiology is still very much a mystery to scientists, and picking the right dosage that keeps someone out without killing them is still very much an art. Studies like this will help them determine how anesthesics work and why.
Your understanding of heredity is a little bit off. The examples you give are perfectly consistent with red hair being recessive, black hair dominant. Here's a simplification of how it works: imagine we have a gene with two alleles, let's call one 'R' for red, the other 'B' for black. Each person has two copies, so the redheaded parent has RR, the black-haired parent has BR. If you look at all the combinations the children could have, 1/2 would be BR (and have black hair), and 1/2 would be RR (and have red hair). For more information, draw a Punnett square, which should spell it out more clearly.
Note, however, that in real life, things are not quite that simple. Hair color is determined by the interaction of a number of genes. Thus, people don't have either pure black, pure blond, or pure red hair. There are many subtle variations.
Also, the other poster, troll or not, was completely wrong about redhead genes fading out because they are recessive. Genes do not change frequency within a population because they are recessive or dominant. If you read up on Hardy-Weinberg Equilibrium why this is true should be clear. Note that in very small populations (under say, 10,000), genetic drift and other random changes in the gene pool could wipe out some variants, but redheads number in the millions worldwide; their genes are not in danger of vanishing any time soon.
"Any fool can make a rule, and any fool will mind it."
--Henry David Thoreau
And no - I am not about to say some racist thing.
I just recall in my days of competitive running that I was taught at the OTC that people with genes from one side of Africa have certain body makeups and are mostly fast twitch fibers, and people from the other side are mostly slow twitch.
What does that have to do with any of this? The odd thing that they also noted was that natural red heads had nearly identical makeups to the fast twitch section of people that they studied in Africa.
This meant that if you were at a track race and were looking at the top runners winning a sprinting race - the odds were going to indicate it more likely that the people of African decent (aren't we all if we go back far enough?) would most likely be genetically from the same area, and the white people would most likely have red hair.
And once I started looking for it, I was impressed that it actually rang true - lots of fast Irish guys.
I've never seen much mention of anything pointing out red heads since that study until now - usually hair color isn't thought to mean much in the grand scheme of things (aside from my preferring blondes).
There are some odd things afoot now, in the Villa Straylight.
Long term exposure to Capsaicin such as extreme hot sauce may cause pain receptors to become "desensitized".
However, pain receptors are completely different from taste receptors. In fact, Capsaicin fakes out the pain receptors as it simulates real damage. This tricks the brain into producing endorphins, which promote a pleasant sense of well-being or even an alterted state of consciousness. The endorphin high can make spicy foods mildly addictive (and for some, such as myself, a complete obsession).