Can you influence the sex of your baby by eating cereal?

This article by Monique Robinson is interesting — not because it tells you anything particularly useful about what you can do before conception to influence the sex of your child, but because it provides a rundown of the many random correlations studies have linked to fetal sex determination over the years. From eating cereal to being a billionaire's kid, it's an intriguing look at how easy it is to find patterns, even when those patterns may (or may not) be totally meaningless. Read the rest

Science, sex, and your hands

Here's an interesting fact about sexual dimorphism: On average, if you were born a male, your hands are a little bit different from those of someone who was born a female. Most men have a pointer finger that is a little bit shorter than their ring finger. Most women have a pointer finger that's about the same length as their ring finger, if not a little longer.

People have noted this differences between the sexes for centuries. But what's it mean? Truth is, we really aren't sure yet. But it is correlated to a lot of awfully interesting things. In fact, some scientists think "the finger thing" (as I like to call it) is a hallmark of prenatal hormone exposure. Because of that, in the scientific literature, you'll find lots of examples of studies that try to find a connection between the finger thing and seemingly disparate traits, such as sexual orientation and gender expression.

We talked about the finger thing on a recent episode of the Sex is Fun podcast—what it's all about, what fingers could be telling us about people, and why it's maybe all just a bunch of hooey. Take a listen!

Also, for the record: My right hand has lady fingers. My left hand does not. How about you?

Sex is Fun

Image: Hand, a Creative Commons Attribution Share-Alike (2.0) image from teleyinex's photostream

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Thought-provoking essay on cause and correlation in modern science

Science is the best method we have for understanding the world. That doesn't mean that everything scientists ever think they've figured out is correct. And it doesn't mean that we're doing science in the best way possible right now.

For a great illustration of this, I recommend reading Jonah Lehrer's new piece in WIRED, about the problems we run into as we learn more about individual parts of complex systems and then assume that we understand the big picture of how those parts work together. A lot of scientific research, particularly in medicine, operates off assumptions like this and it can lead to big mistakes. Case in point: Back pain. In this excerpt, Lehrer explains how MRI technology that allowed doctors to get a better look at the spines of people with back pain led them to make inaccurate conclusions about what was causing the back pain.

The lower back is an exquisitely complicated area of the body, full of small bones, ligaments, spinal discs, and minor muscles. Then there’s the spinal cord itself, a thick cable of nerves that can be easily disturbed. There are so many moving parts in the back that doctors had difficulty figuring out what, exactly, was causing a person’s pain. As a result, patients were typically sent home with a prescription for bed rest.

This treatment plan, though simple, was still extremely effective. Even when nothing was done to the lower back, about 90 percent of people with back pain got better within six weeks.

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