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In every drop of ocean water, there are one million bacteria. There are also 100 million viruses. Some of them keep us alive, some are trying to kill us.

Humans have survived despite world-wide pandemics such as the Black Plague, smallpox, cholera, yellow fever, malaria, tuberculosis, influenza, HIV, coronavirus. How and what is next?

Eighteenth-century milkmaids never got smallpox. This created the vaccine revolution which many intelligent people do not believe in. We will learn how our immune system keeps us alive.

A review of amazing life cycles for those little creatures in animals and humans. Why a hookworm infection cured someone’s asthma and the distraction parasites may play in our autoimmune diseases.

There are many brilliant people in medical history (Semmelweis with hand washing, Fleming with penicillin, Snow with Cholera) and many who we would like to forget (Tuskegee syphilis study, Arsenic quacks in the 18th century, Brinkley transplanting goat testicles into impotent men).