medicine for crowds, not patients — it saves you before you know you're sick.
means the science and practice of protecting the health of whole populations through prevention, policy, and infrastructure rather than treating one patient at a time.
from emerged from 19th-century sanitation reform, when john snow traced a london cholera outbreak to a single contaminated water pump in 1854, proving disease could be stopped at the source, not just the bedside.
john snow's pump — removing one handle ended a london cholera outbreak, 1854
smallpox eradication — who declared it gone globally in 1980, only human disease erased
seatbelt laws — cut US traffic deaths by roughly 45 percent per crash
iodized salt programs — prevented widespread mental disability across dozens of countries