I have nosebleeds if I don't have a humidifier after I turn on the central heat. Once I start using the humidifier my nosebleeds stop.

These so called old wives tales or Folk medicine have been tried and tested since antiquity, they are used because they work. Folk medicine was never static but is always updated with the times. It is a vast repository of health knowledge
It is good to see that the scientific community is confirming what has worked and is working so we can help ourselves properly and cheaply, as it should be.