25 amazing facts about twins – #12 can help you conceive twin kids

Facts about twins: Twins have fascinated mankind for thousands of years. Even today, when having five or even six little ones in a go isn’t impossible, twins still draw attention, speculation and intrigue. Yet many still don’t know all that much about what causes the phenomenon or what it really means to be a twin. Whether you’re in nursing school or just like learning about the medical field, here are some interesting, amazing and fun facts about twins you might like to know.

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A whopping 22% of twins are left handed. Amongst the general population, the number shrinks to 10%. Handedness isn’t always a clearly genetic trait, and the factors that go into it can be quite complex. In fact, scientists are not even entirely sure how or why so many twins are left-handed – just that it very likely has to do with a connection between a genetic predisposition for twinning and a genetic bias for left handedness. Why are the two connected? We still don’t know.

1, Rates of twin births vary by location. Certain areas of the world and our own nation have much higher rates of twin births than other places. For instance, if you live in Massachusetts, New Jersey or Connecticut, the twinning rate is 25% higher than the general populace. On the flip side, Hawaii and New Mexico have a twin birth rate 30% lower than that of the national average. Scientists believe that this propensity for multiple births is the product of multiple factors involving fertility drugs, heredity, food choices and age.

2, While most people are only familiar with identical and fraternal twins, there are actually 7 different types of twins. They are: identical, fraternal, half-identical, mirror image twins, mixed chromosome twins, superfecundation, and superfetation. Those other than identical and fraternal can be quite rare.