We now know that sex is complicated enough that we have to admit nature doesn't draw the line for us between male and female, or between male and intersex and female and intersex; we actually draw that line on nature.

When I ask my medical students to describe their image of a woman who elects to birth with a midwife rather than with an obstetrician, they generally describe a woman who wears long cotton skirts, braids her hair, eats only organic vegan food, does yoga, and maybe drives a VW microbus.

We say, 'You may drink at the age of 21 but not at the age of 20.' Why? Because humans like to create terribly neat categories out of nature because it allows us a nice, tight social organization. The truth is, nature doesn't care that we like nice, neat social organizations. Nature likes variety.

I don't know what has caused this reawakening in academia. Obama? The GOP's assaults on science and on patients? Jon Stewart? I'm not at all sure. I just know I don't feel nearly as alone in academia as I used to. I'm feeling increasingly surrounded by fellow Ph.D.'s and by M.D.'s who seem to be taking a lot of things personally.

If we have a situation where a man is particularly graceful in a sport that rewards grace - say, for example, figure skating - why is it that we don't say to the man, 'Well, you're too feminine to compete?'... I don't understand why we don't find it offensive also to say to a women who's very strong, 'You're too masculine to compete.'

I actually completely suck at being a bioethicist. What I do is history of medicine and patient advocacy. Patient advocacy is actually the opposite of bioethics, because bioethicists are the people who increasingly set up and justify the systems we patient advocates have to fight.

Want to be a well-paid bioethicist, with one, two, or even three university appointments? Just get yourself a two-piece navy polyester suit and follow these three simple rules: (1) Never name names. (2) Screw principles; just follow procedures. (3) Bury the money.

A hospital may spend several million dollars separating a pair of conjoined twins even though that separation is likely to leave them worse off.

I do work half time as a historian of medicine at Northwestern University's Feinberg School of Medicine, and I started my career with work in the 19th century.

Doctors are human animals. They want to be loved, they are tribal, they instinctually favor stories over scientific evidence, they make mistakes, and even small gifts make them susceptible to being biased.

After I dropped out of college at the age of 19, I became a mortgage broker, and when I went back to school I thought about going into real estate law.

Doctors are human animals. They want to be loved, they are tribal, they instinctually favor stories over scientific evidence, they make mistakes, and even small gifts make them susceptible to being biased. If we took doctors seriously as human animals, we might hurt them - and they might hurt us - a lot less.

What we should care about is health - reduction of morbidity and mortality. Too often, we instead pay attention to whether something is 'normal.' A hospital may spend several million dollars separating a pair of conjoined twins, even though that separation is likely to leave them worse off.

Using medicine in the service of cosmesis is generally bad for patients, bad for doctors, and bad for democracy. The only exceptions are when we know the intervention will actually reduce suffering, as with a primary cleft lip repair.

After I dropped out of college at the age of 19, I became a mortgage broker, and when I went back to school I thought about going into real estate law. I probably would have made a lot more money and died of boredom by now.

If we are going to have to worry all the time that we might offend some students' sensibilities, we are not going to be able to teach in a way that actually matters. We're not going to be able to teach about sex, gender, race, religion, or violence.

As a kid, I did some running but especially loved biking and swimming. I grew up on Long Island, and our mom took us all the time to the ocean, so I grew up doing open-water swimming in the Atlantic.