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I don't think I can be your friend, Isabella said.
Rebecca's stomach flipped.
This is the love story of real hinge couple Isabella and Rebecca, written and read by me, Tammy Denton-Hurst.
Listen to the free audiobook now.
For Scientific American Science Quickly, I'm Rachel Feltman.
When heterosexual couples struggling to conceive seek medical assistance,
sperm often don't get as much attention as they should.
Standard tests measure sperm count and motility,
but this ultimately just shows how likely a sperm is to make it to the egg.
And that moment of conception is just the first of many steps to the implantation of a growing embryo,
let alone the gestation of a healthy fetus.