To tell twins apart, look at their…
…belly buttons! Navels are scars from the detachment of the umbilical cord after birth, so they aren’t caused by genetics. Another way to determine who’s who: Take fingerprints. Identical twins may share DNA, but exposure to different areas of the womb during development affects the fingertips’ ridges and whorls.
New research has discovered that there’s more to nose shape than genetics.
Twins can be conceived by two different fathers
Heteropaternal superfecundation occurs when a woman has sex with more than one man during ovulation. Sperm from each man fertilizes an egg, resulting in twins. Though this phenomenon is common in dogs and cats, it’s extremely rare in humans.
The chance of having twins is much higher than it was 30 years ago
The birthrate for twins in the United States has increased 76 per cent since 1980, an uptick that some experts attribute to older women having children (women in their thirties are more likely than women in their twenties to have twins). Or maybe women are getting taller: A Long Island Jewish Medical Center study found that women who birth twins or other multiples were, on average, more than an inch taller than women who only birthed one child at a time.
Some parts of our body get more credit than others. Read up on the fascinating bits you’ve never considered.