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.
The padlock means your connection is encrypted and the address matches its certificate. It says nothing about who runs the site or whether it's honest — most phishing pages have one too. Check the domain, not the lock.
In an ordinary home, cleaning with detergent and water is usually enough; disinfect where it matters — someone ill, vomiting or diarrhoea, weakened immunity — on a clean surface, exactly as the label says, and never mix products.
A normal cycle is a wide range rather than an exact number of days; changes, heavy bleeding and pain that disrupt your life are reasons to see a doctor, and sharp pain or bleeding with faintness call for emergency help.
Every contraceptive method has two effectiveness figures: on paper and in everyday life. The less a method depends on daily care, the smaller the gap, and only condoms also protect against infections. The table is a map, not a prescription.
The chance of conceiving falls with age for both partners, but it does not stop on a single date; if pregnancy does not come, both partners are checked, and the older the woman, the sooner.
Many STIs cause no symptoms, so testing goes by age, risk and the time since contact. After a possible HIV exposure, preventive treatment works only if started within days, so go to a clinic at once rather than wait for a test.
Emergency contraception is not an abortion pill, and it works better the sooner it is used; the copper IUD is the most reliable option. Go to a pharmacy or clinic as soon as you can, and get urgent help for severe abdominal pain.
Compare loans by the total you repay and the full annual cost, not by the rate or the monthly payment; fees, insurance and the length of the loan change the price more than they seem to.
Your liver clears alcohol at its own pace, and coffee, a cold shower or sweating do not hurry it. Neither the clock nor how you feel tells you that you are sober — and a very drunk person should never be left alone to sleep it off.
A hangover is inflammation, poor sleep and a rebound of the nervous system, not just thirst; no remedy has good evidence behind it, and the hair of the dog can make it last longer.
A single abnormal result more often calls for a repeat and some context than for treatment — but when the lab calls a result critical, or you feel seriously unwell, contact a doctor at once rather than wait.
Airing, an air purifier and a humidifier solve three different problems and none replaces another; a CO₂ monitor shows only how well a room is ventilated, and carbon monoxide needs its own detector.
Leftover rice is safe when it goes into the fridge quickly and is eaten soon, reheated until steaming hot: the Bacillus cereus toxin that forms in rice left warm survives any reheating.
Your nose detects spoilage, not the bacteria that cause food poisoning, so smelling works for best-before food and not for use-by food or leftovers; for those, the date and the clock decide.
An expiry date is the last day of guaranteed strength, not a switch, and the medicines to replace first are the ones where a weaker dose costs: insulin, adrenaline, nitroglycerin, antibiotics.
Vomiting and diarrhea take out water and salts together, so a measured rehydration solution in small sips replaces both, while sweet drinks and plain water alone do not.
A child's dose of paracetamol or ibuprofen comes from weight or age and from the strength on this bottle, one drug at a time, and the tables differ between the UK, the US and Russia.
Paracetamol and ibuprofen are different drugs with different risks, so the dose, the interval and the days depend on your health, your weight and the leaflet of your country.
