DEAR MAYO CLINIC: My mom always scolded me for not drying my hair after washing it, telling me I’d catch cold. She also talked about dressing right for the weather, starving a fever and lots of other things. I’m wondering if there is any truth in any of these sayings. With COVID-19 still lingering, I’m trying to convince my children, ages 8 and 12, to be more mindful about germs. ANSWER: Colds…