Your Mom is a Chimera — LessWrong
And so are you! • When you were a fetus, you were sending millions of your cells through the placenta into your mom. And she was sending her cells in…
x Your Mom is a Chimera — LessWrong Biology Parenting Practical World Modeling Frontpage 54 Your Mom is a Chimera by michaelwaves 12th Apr 2026 3 min read 1 54 And so are you! When you were a fetus, you were sending millions of your cells through the placenta into your mom. And she was sending her cells into you, although to a lesser degree. These cells made themselves right at home, differentiating into heart, blood, and even brain cells. This phenomenon is called feto-maternal microchimerism , and is one of the wildest things in placental mammal pregnancy. What? Microchimerism is generally d
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