How Many Times Does Your Heart Beat in a Lifetime?
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If you use an average of 80 beats per minute, your heart beats about 4,800 times per hour.
That's a whopping115,200 times per day.
Over the course of a year, your heart would beat about 42,048,000 times!
If you live to be 80 years old, your heart would have beaten approximately 3,363,840,000 times!
Dolphins Keep an Eye Out While Sleeping?
Dolphins Keep an Eye Out While Sleeping.
Dolphins have a clever trick that doesn't involve jumping in the air for fish:
They can overcome sleep deprivation and remain constantly vigilant for days at a time by resting one half of their brain while the other half remains conscious