Even if you’ve never met an identical twin (or two) you’re probably familiar with famous ‘90s superstars Sister Sister’s Tia and Tamera Mowry, or The Parent Trap’s Hallie and Annie Parker (played by Lindsay Lohan and Lindsay Lohan). While the number of twins has been increasing in the last three decades, it’s still rare: Approximately 3.3 percent of babies born today is a twin (either identical or fraternal), compared to two percent in 1980, and identical twins are less common than fraternal twins. However, doctors in Australia have just published a report in The New England Journal of Medicine confirming that they’ve been monitoring a set of the rarest kind of twin — the second set of semi-identical twins ever recorded. Here’s how this happens, and what it can

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