My mom is an identical twin. My mom’s mom was also an identical twin.

There were at least two other sets of twins in my family when I was growing up; one identical, the other fraternal. So, growing up around people who looked exactly like each other seemed perfectly normal to me.

However, the rest of the world seems mesmerized by this fairly common gift from nature.

Wikipedia indicates that out of every 1,000 births in America, about 33 are twins.

The most common ...