Brain Teasers :)))

Hi there,

 From now on, everyday I am going to ask a question to you. Don't worry, they will not be about Reading or Writing lessons :)... They will be very good mental exercises, in other words, they will help you keep your brains alive... It's said that, mental exercise is a very good way to avoid Alzheimer's disease( Does anybody know what it is??? )  so I say "It's better safe than sorry!" ( by the way I'm also adding an idiom dictionary link, check it out :)) )