Smaller than 1 , your 2 just goes on and on. It will 3 a minute for 70 years or more. That's something 4 most of us take for granted. But it's 5 . And, 6 , your heart does 7 without ever complaining! You never know 8 . Your heart is such a reliable " 9 " that people 10 . For many, the first indication that their heart isn't 11 properly is 12 ! Like accidental deaths, many 13 can be avoided if people simply follow 14 . Unfortunately, most people seem to listen to 15 that says, "It won't happen to me." So these people 16 smoking and drinking. They continue 17 . And their only "exercise" is 18 .