I am a retired mechanical engineer. I finished my university degree in Hong Kong University in the year 1976 and got the designation of M.I.Mech.E. as well as Chartered Engineer from the Institution of Mechanical Engineers from UK. I like mathematics though I did not take any mathematics courses after university. I have high risk of getting Alzheimer's disease since my mother and grand mother has it. I try to avoid It by continuing solving mathematic problems as I still remember some basic theories.