Mary is worried because dementia is common in her family. she does not want to get that disease. what can she do to decrease her risk

Although much investigation is still needed into the field, typically brain stimulation such as reading, writing, puzzles and healthy sleep tends to be related to a lower risk for dementia. if the disease is genetic her risk is far higher than a dementia related to trauma and disease.

An epidemic is a large and localized outbreak of a sickness or disease.  a pandemic is a large global outbreak of a sickness or disease.