A blind man and his wife live alone on an island...He is ill and relies on his wife to give him 1 white tablet and 1 red tablet every morning, which he needs to survive throughout each day...After a bad argument with his vindictive wife, she tells him that today she has placed 2 white tablets and 2 red tablets in front of him, knowing that if he takes 2 tablets of the same colour he will die...Even though all the tablets are the same shape and size, he laughs mockingly, confidently taking the correct coloured tablets as required and survives the day...How did he do it?