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A typical smartphone can host thousands of microbes on its surface, often more than nearby household surfaces if you rarely clean it.

An average adult carries about 30–50 trillion bacterial cells on and inside the body at any given moment.

Your body carries around 30 trillion human cells and about 38 trillion bacterial cells packed into a few major sites.

Most adults are better off keeping bacon to one or two small portions a week, and treating it as an occasional processed meat rather than a staple.

A dog’s mouth carries billions of bacteria, mostly harmless to people, though a few can cause infection through bites or contact with broken skin.

Human stool contains roughly half its dry weight as bacteria, adding up to tens of billions to trillions of microbial cells in each bowel movement.

Snow can hold hundreds to tens of thousands of bacterial cells per milliliter, and the number jumps near cities, roads, ski slopes, and old snowbanks.

Most home baking recipes stay balanced with about 1 to 1½ teaspoons of baking powder per cup of flour.

Use a 1:1 mix of baking soda and fine salt, sprinkle a light layer on carpets, leave 12–24 hours, then vacuum slowly to hit fleas.

Most active adults who use baking soda before exercise stay within 0.2–0.3 g per kilogram of body weight, taken about 60–180 minutes before training.