"The Science Behind Conjoined Twins: Exploring Their Unique Lives and Challenges"
Conjoined twins are a rare phenomenon, with an estimated occurrence of one in 30,000 to one in 200,000 worldwide, and the majority aren't born alive. The cause of conjoined twins is unclear, but there are two theories about their development in the womb: a single fertilized egg not fully splitting, or the fusion of two fertilized eggs. The oldest living conjoined twins, Lori and George Schappell, recently passed away at age 62, while former TLC reality stars Abby and Brittany Hensel continue to defy medical expectations and work as fifth grade teachers.