The protective substance is an important barrier between the body and the environment. Here’s how researchers are using it to understand health. Credit: Wikimedia Commons/CC BY-SA 4.0 When Pilar Vigil ...
The Ache: At-home ovulation-predicting methods for optimal fertility, such as urine test strips, can be messy and expensive—and sometimes don’t work. The Claim: In a technique called “ferning,” tiny ...
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