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Infection and immunity Whether an infection passes or stays is decided as much by the host as by the microbe — and the host genes that decide it are usually the o… Liver The organ people only think about when a blood test comes back odd. Two of its commonest numbers are partly inherited, which is why a raise… Fertility Genetics has a great deal to say about the timing of reproduction across populations and almost nothing to say to one person trying to conceive. Alcohol and the flush One of the few places where a single variant is visible in the mirror. Exercise and muscle The "sprinter gene" is the most oversold result in consumer genetics. Allergies Allergy runs in families and rose too fast for genes to explain. Both of those are true, and holding them together is the whole subject. Gut and food intolerance Bloating, dairy, gluten — the most-searched symptoms with real genetics behind some. Brain and memory What actually changes in a brain over a lifetime, and which of it is written down in advance. Depression and stress The field that taught genetics its hardest lesson about single genes. Learning and focus Whether the difficulty of sitting down to study is partly inherited — a question with real, and repeatedly overstated, research behind it. Anxiety and worry The largest study of the trait behind this found it was not one trait. “Worry” and “depressed affect” came apart in the data, which is a fi… Sleep and insomnia Why some people wake at 5am without an alarm and others cannot. ADHD and attention Diagnoses are rising fast; the genetics is real and highly polygenic. Smoking and vaping How hard quitting is turns out to be partly a metabolic question.