This noise has been going on for over 67 years and I have been making it. It is my heartbeat. I have recorded about 70 beats. Think about it: at around 70 beats per minute and more sometimes, it has been at it for 66 years, it has contracted and relaxed billions of times without stopping. Do the calculation on your calculator:
70 beats x 60 minutes x 24 hours x 365.25 days x 68 years
Note that you can add quite a bit since it started beating long before
I was born and it has had to work a lot faster when I have taken some exercise!
Tomorrow (18/11/2014) I will be 25008 days old!
My heart will have made more than 2.52 billion beats!
Each beat has a double sound, they are the two sides of the heart beating almost but not exactly at the same time. You can hear the noise made by the bicuspid and tricuspid valves closing when the two ventricles contract.
You could calculate how many times your own heart has beaten since it started, but do remember it started a few months before you were born.
Please be patient if you want to hear my heartbeat, the file is about 156Kb Sorry about the background noise, that is my computer system.
If you have a watch with a seconds hand, you can estimate the number of beats per minute. Just count the number of beats in 10 seconds and multiply by 6, or count the number of beats in 15 seconds and multiply by 4.
Finally, you could download and store 60 seconds of my life on your hard disk: it is about half a Mbyte so it will take a couple of minutes.