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Blood sample lies on an allergy test sheet.

Feb. 26, 2020

3 minute read

Antibiotics and Allergies

Emily Oster, PhD

A pair of black boxer briefs hang from clothes line against a blue sky.

Updated on Apr. 18, 2025

2 minute read

What Negatively Impacts Male Fertility?

Emily Oster, PhD

Three older men walk together on a sidewalk while having a conversation.

Updated on Apr. 18, 2025

6 minute read

Does Sperm Get Worse With Age?

Emily Oster, PhD