You may remember the experiment in 1995 in which female (presumably heterosexual)college students were asked to rate the “pleasantness” of the smell of several unwashed T-shirts that had been worn for two nights by several different male students. It showed that the more different the woman and man were in their genes (in particuar, the ones that cause immune responses), the more “pleasant” she rated his T-shirt.
In other words, the less they both had genes that serve the protective function of causing immune responses, the more likely the woman would be sexually attracted to him. On average, heterosexual couples share only about 20% of their immune system genes. So, when it comes to immune system genes, opposites do attract.Read the whole article
Deep in the recesses of most people's refrigerators lives a half-eaten bottle of salsa, some takeout Chinese food and last week's chicken dinner. Pulling one of those things out, you wonder: Can I eat it? Is it safe? A lot of commercially prepared items, such as sauces and condiments, have...Read More
Using a combination of 3-D printing and cultured cells, scientists in China have grown new ears for five children born with a defect in one ear called microtia, which impacts the shape and function of the ear....Read More
Drooling, crankiness and tears can make teething an ordeal for parents and babies alike. Here's help easing the pain — for both of you. What's typical? Although timing varies widely, babies often begin teething by about age 6 months. The two bottom front teeth (lower central incisors) are usually the first to...Read More