Echo Syndrome is a sci-fi story about a condition that causes people to split into multiples. I won’t write more because the weirdness is part of the allure. I loved this story:

When my daughter climbs in the car, there’s three of her. They shouldn’t all fit in the passenger seat, but they overlap each other to save space. Together they reach for the seatbelt, their movements almost in unison but not quite; their asynchrony makes me slightly nauseous, and I swallow hard before putting the car into gear and inching out of the school parking lot.