Explainers for the things nobody taught you at school and even parents don't always know: how a cold spreads and why it lasts a week, what a painkiller actually does, when leftovers become unsafe, what the humidity meter is telling you. Each page gives the short answer, the mechanism in plain words, what to do, the exceptions, and the sources — so you understand it once and use it for years.
Grip the tick close to the skin with fine tweezers and pull it out steadily; skip oil, heat and nail polish. See a doctor within days if a rash, fever or aches appear in the following weeks.
Lay the person down and check breathing: not normal means an ambulance and CPR; normal — raise the legs. Call one too if they don't come round quickly, fainted on exertion or have chest pain, palpitations or a seizure; see a doctor after a first faint.
Call for help at once and check breathing: if they are not breathing normally — gasping doesn't count — start CPR; if they are, put them on their side. Don't make them sick, and get extra paracetamol checked today even without symptoms.
A deep pot of hot food stays warm in the middle for hours, so split it into shallow containers and get it chilled within two hours; the US and UK disagree only on whether it can go in the fridge hot.
Put a heat burn under cool running water as soon as you can, cover it loosely and skip butter, oil, ice and toothpaste; large, deep, chemical or electrical burns, burns on the face or hands and burns in small children need urgent help.
After a blow to the head, rule out the danger signs first — repeated vomiting, a worsening headache, confusion, a seizure or being hard to wake mean an ambulance — and don't leave the person alone for the first day.
Reheating kills live bacteria but not the toxins some leave behind while food sits warm, so leftovers are made safe mostly by fast cooling and short fridge time; heat is the last step, not the fix.
A hygrometer shows whether your home is too dry or too damp; above a sensible range dust mites and mould thrive, and condensation means the cause needs fixing.
Short, wide-open airing several times a day moves stale, moist air out better than a window left ajar for hours; how long it takes depends on wind and weather, and smoke or pollen outside are reasons to keep windows shut.
Most cleaners need time on the surface to work: spray, walk away for the time on the label, then wipe. A disinfectant works only while the surface stays wet, and only on a surface that is already clean.
Mold grows where moisture meets a cold or leaking surface: fix the moisture first, clean small patches with detergent and water, and leave large areas and sewage water to professionals; people with asthma or weak immunity should not clean it themselves.
Chlorine bleach goes with water only: with acids such as vinegar and toilet cleaners, or with ammonia and urine, it gives off toxic gas. If you breathe the fumes, get to fresh air first; any trouble breathing is an emergency call.
Caffeine stays in the body longer than the alertness lasts, and people clear it at very different speeds; a late cup can shorten and lighten your sleep even when you fall asleep easily.
An underactive thyroid is one possible cause of constant tiredness, not the only one; a thyroid test starts the conversation with a doctor rather than ending it.
A humidifier can make dry winter air easier on eyes and nose, but it has not been shown to prevent colds at home; keep it clean, keep the air moderate, and turn it down when windows start to fog.
Handwashing works by the moment, not by how dirty hands look: plain soap and water around food, the toilet, coughing and caring for someone sick — it lowers transmission, not symptoms you already have.
No amount of alcohol is safe for health, and the drink that helps you nod off breaks up the second half of the night. Less is better; for some people the right amount is none — and with dependence, stopping needs a doctor's help.
Sunscreen protects against sunburn and skin cancer and slows skin ageing — but only if you use enough and reapply. SPF covers burning rays only, so look for UVA protection too, and never treat it as a reason to stay out longer.
