My mother is a twin and I think it's pretty cool, having siblings that are produced at the same time !
Awesome. That's rare!
Yes, she's a fraternal twin, so they developed from two different eggs. But, still pretty cool.
Do twins run in the family?
I think every third generation on my mother's side. So, it's strange that in fraternal twins, each has it's own sperm cell that is fertilized, and not one cell.
Wow, I wonder if it is more common in one country or another.
It does actually! The Yoruba people have the highest around the world. they have about 45 sets per 1000 births.