During an average lifetime, the human heart will beat more than 2.5 billion times. Give a tennis ball a good, hard squeeze. You're using about the same amount of force your heart uses to pump ...

Your heart is an exquisitely engineered pump made almost entirely of muscle. And you can see the extraordinary engineering in action if we slow your heart to a single beat. Inside the cavernous ...

Lisa Maria Glenk from the Messerli Research Institute for Human-Animal Interaction at the ... physiological values for stress reaction such as heart rate or the stress hormone cortisol were ...