The word 'salary' comes from 'salarium'

The word 'quarantine' comes from 'quaranta giorni'

Quarantine originates from 'quaranta giorni' — 40 days ships waited in Venice during plague

Hot chocolate

Chocolate was a bitter drink in Mesoamerica for 3,000 years before Europeans added sugar

Concrete

Human bones are stronger than concrete — ounce for ounce, bone is stronger than steel

Henrietta Swan Leavitt

Henrietta Leavitt discovered the period-luminosity relation of Cepheid variables

Honey never spoils

Edible honey preserved for 3,000 years in Egyptian tombs

Discovery of penicillin

Alexander Fleming discovered penicillin by accident in 1928