The demise of former President APJ Abdul Kalam has been an irrevocable loss to the nation. But it is a loss we will have to accept. He may no longer be with us, but he continues to look upon us from above and his words and spirit continue to motivate us. Dr Kalam has said several great things during his lifetime and his twitter account is a witness to that. Let us read 15 of his greatest tweets and feel blessed that we have all been touched by his greatness in one way or the other.