Why do women have periods?
How menstruation works – Emma Bryce
How do pregnancy tests work? – Tien Nguyen
How in vitro fertilization (IVF) works – Nassim Assefi and Brian A. Levine
How do contraceptives work? – NWHunter
Why it’s so hard to cure HIV/AIDS – Janet Iwasa
How bees help plants have sex – Fernanda S. Valdovinos