שבועות - Shavuot

Shavuot 15b ~ The Forgotten Havdalah of Rabbi Akiva

Psalm 91 protects against plagues and demons. So best keep saying it.

Shavout 18b ~ The regularity of the menstrual cycle

It is normal for the length of the menstrual cycle to change from one period to the next.

Shavuot 25a ~ How Long Can You Go Without Sleep?

Rabbi Yochanan thought about three days. But it’s a lot longer than that.