Ключевые слова: activity, adult, attack, background, beat, blue, business, cardiogram, cardiology, checkup, consulting, curve, device, doctor, double, ecg, entrepreneur, exposure, frequency, hands, healthy, heart, heartbeat, icon, infographic, innovation, internet, key, keyboard, laptop, light, medicine, multi, network, online, pc, poly, pulse, rate, research, room, surgery, symbol, technology, tool, touch, typewriter, typing, web, writes,