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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… Bones and fractures Bone density is one of the more heritable things about a body — and the thing that actually matters, whether it breaks, is much harder to p… 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. Brain and memory What actually changes in a brain over a lifetime, and which of it is written down in advance. Longevity and ageing The supplement industry's favourite word, and what the data supports. 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. Sport and performance Talent tests sold to parents, and what the research behind them actually supports. Running and endurance Running clubs, first marathons, and a watch telling you your VO2max. Smoking and vaping How hard quitting is turns out to be partly a metabolic question. Personality Whether the shape of a personality is partly inherited — and the twenty years of famous findings that turned out not to replicate. Risk-taking and impulsivity Trading, betting, and every "should I?" at 2am. Over a million people were studied: 99 positions turned up, 46 of them shared with risky be…