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Can you get pregnant by two different guys at the same time?

Superfecundation twins: When a woman has intercourse with two different men in a short period of time while ovulating, it's possible for both men to impregnate her separately. In this case, two different sperm impregnate two different eggs.

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Paternity tests usually give a straightforward answer—a man either is or isn’t the father. But, for a woman in New Jersey suing for child support, things are a little more complicated. It turns out the man she thought was the father of her twins was only the father of one of the pair. That result is rare—so rare that the condition has the improbable name “superfecundation.” But it turns out a lot of things can happen when it comes to birthing multiple children at the same time. Here are the different types of multiple births: Superfecundation twins: When a woman has intercourse with two different men in a short period of time while ovulating, it’s possible for both men to impregnate her separately. In this case, two different sperm impregnate two different eggs. This is what happened to the woman in New Jersey. One child was the product of her relationship with the man she brought to court, and the other child was conceived during a separate encounter with another man. While this phenomenon is rare, research suggests it does happen from time to time. A 1992 study found that superfecundation twins were at the root of more than 2% of paternity suits in the United States involving twins. Fraternal twins (50% shared genetics): Fraternal twins result when two separate sperm fertilize two separate eggs. Both babies are a mix of the mother and father, but they don’t share the exact same genetics. Polar body twins (75% shared genetics): You might think of polar body twins as half-identical twins. They occur when an egg divides in two during ovulation, creating a primary body and a polar body, both of which have the same genetics. In most cases, the polar body, which has less cytoplasm, will die off, but in some cases both the primary body and the polar body will be fertilized by separate sperm creating twins with identical genetics from the mother and different genetics from the father. While the theory of polar twinning makes sense from a scientific perspective, there’s some disagreement among scientists about whether polar twinning actually occurs in the real world. Identical twins (100% shared genetics): Identical twins result when a single sperm fertilizes a single egg and the resulting cell then divides in two. The two bodies, soon to be babies, share the same genetics and look the same. Things can get complicated when you start dealing with triplets, quintuplets, and even bigger single-pregnancy broods. For instance, a mother having triplets could have identical twins from the same egg and a third child from an entirely different egg and sperm. Once you start to mix and match like that, the possible combinations—to say nothing of the dynamics of the playroom—can get very complex.

Write to Justin Worland at justin.worland@time.com.

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How long before bed should you eat chocolate?

Of course, caffeinated beverages such as coffee and colas are out. You should try to not eat any chocolate after around 4 or 5 pm to give your body time to metabolize its caffeine. Generally, it's also a good idea to stop eating at least 2 hours before turning in for the night to give your food time to digest.

Two guilty pleasures that also happen to have nutritional and health benefits are peanut butter and chocolate. Put them together and you have what some would consider the ultimate comfort treat. How else can you explain the fact that peanut butter cups are one of the top-selling candies in the United States generating annual sales of over $2 billion? Or consider the tradition, which goes back to the 1950s, of hotels leaving a chocolate on your pillow as part of their turndown service. So, it would be understandable if you told yourself that having one or the other – or even both together – as your bedtime snack is probably fine or perhaps even a good idea! After all, both may put a smile on your face before you drift off and that can’t be all that bad. The truth, however, as with all things related to food and nutrition, is not quite that simple. It turns out that one of them is a great idea for a bedtime snack while the other is best enjoyed earlier in the day. For the peanut butter lovers, the good news is that eating peanut butter before turning in for the night has a variety of health benefits. For the chocolate lovers, I’m sorry to say that it probably is not your ticket to a restful night of sleep and pleasant dreams.

Let’s look at each individually.

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