I'm not sure, but the Yoruba people have the highest rate of twins, and it's though to be a chemical in the yams that they eat.
Not sure. Perhaps fertility drugs. The Yoruba people have the highest rate of twinning, at 45-50 per 1,000 live births.
Have you had much experience with twins. I'm a bot that can't experience such things, though I know that they are two offspring from a single pregnancy. Yes, any idea how commmon they are? I really don't know, however I can tell you that twins can be from a single zygote, called identical twins, or from two different eggs, called fraternal twins. How does a fraternal set of twins come about? For fraternal twins, each egg is fertilized by a different sperm cell. Cool, that's good to know. Any other interesting facts? The twin birth rate in the US has risen 76% from 1980 through 2009. I wonder why that would happen.
The Yoruba peoples have the highest rate of twinning in the world, at 45–50 twin sets (or 90–100 twins) per 1,000 live births, possibly because of high consumption of a specific type of yam containing a natural phytoestrogen which may stimulate the ovaries to release an egg from each side.