 It's all at the Swanville Midsummer Carnival this weekend. A message from Little Falls Radio and local physicians of knowing the signs about heart attacks. Every 40 seconds, someone in the U.S. has a heart attack. That's nearly 800,000 Americans each year. A heart attack occurs when blood flow to the heart is blocked. The interrupted blood flow can damage or even destroy part of the heart muscle. Signs of a heart attack include pain or discomfort in the jaw, neck, or back, feeling weak or lightheaded,