To watch someone's short term memory fade...personality change...is just unbelievably sad...A very clever man who has worked all over the world in the oil industry ...who can still,albeit takes longer..do sudoku...read the paper,watches and comments on the news...remembers the past...but cannot now remember something from minutes ago,sense of humour altered,..cant follow instructions....its very hard to watch and to live with in all honesty, constant repetitiveness is tiring...I've never really encountered this before...no memory problems in my family...Hs mother (estranged) had dementia....I'm now seeing the true cruelty of this disease...