Health & Medicine questions
27 fact-checked questions — tap any to predict the answer, then read why.
- Why call a vet immediately if your cat has true-lily pollen on its fur, even when it looks well?
- Why can chronic inflammatory disease make some body tissues age faster than others?
- Why do water-resistant sunscreens say 40 or 80 minutes rather than 'waterproof'?
- Why doesn't SPF makeup protect the skin all day after one morning application?
- Why can using too little sunscreen make the label SPF unreliable?
- On a sunscreen label, which term indicates that the product covers both UVA and UVB?
- Why doesn't SPF 15 simply mean fifteen hours before you burn?
- Why does SPF 50 beat SPF 30 by only about 1 percentage point?
- When a sunscreen label says SPF 30, what does that number actually tell you about the UV protection it gives your skin?
- How do painkillers such as ibuprofen and aspirin reduce inflammatory pain?
- Why do fevers help fight infections?
- Why does sunscreen protect skin?
- Why do we feel nauseous when dizzy?
- Why can a transplanted organ be rejected even when donor and recipient blood types match?
- How does a broken bone rebuild the damaged area?
- Why do we get allergies?
- Why do antibiotics not work on viruses?
- Why do we get headaches?
- Why does sunburn hurt?
- Why do some people need glasses?
- Why do ears pop on airplanes?
- Why does skin heal after wounds?
- How does the physical action of toothbrushing help protect teeth and gums?
- Why do vaccines prevent diseases?
- Why does ice reduce swelling?
- Why do bruises change colors?
- Why do cuts bleed then stop?