Start here · Essential guide
How the Five Senses Work
A plain-language overview of how sight, hearing, smell, taste and touch turn physical signals into nerve impulses that the brain reads as experience.
Body and Mind
Senses, Genes and Immunity
How we sense the world, inherit traits and defend against disease.
How Antibiotics Work and Why Resistance Matters
General information on what antibiotics target inside bacteria, why they do not work on viruses, and how antibiotic resistance evolves and spreads.
How Digestion Works
Follow food from the mouth through the stomach and intestines, and see how enzymes, bile and the gut lining break it down and absorb nutrients.
How the Immune System Defends the Body
An introduction to the layers of the immune system, from skin and inflammation to white blood cells, antibodies and immune memory, in plain language.
How Traits Are Inherited
Learn the basics of genetics: how genes and alleles are passed from parents, what dominant and recessive mean, and why children resemble their parents.
How Vision Works
Follow light through the cornea, lens and retina, and see how rods, cones and the brain turn it into the images we see, plus why vision sometimes blurs.
How We Hear
See how the outer, middle and inner ear turn sound vibrations into nerve signals, and how the brain interprets pitch and loudness.
What DNA Is and What It Does
A plain-language look at DNA: the double helix, the four-letter code, how genes are used to make proteins, and what mutations are.
What Is the Gut Microbiome?
An explainer on the microbes living in the digestive tract, what they are known to do, and the open questions that researchers are still working on.
Why Do We Dream?
What scientists know about dreaming and REM sleep, and the leading theories about why we dream, from memory to emotion, none of which is settled.
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