There are 400 miles of blood vessels (that includes veins, and capillaries, which are smaller, teeny weeny veins). The brain uses 20% of oxygen we inhale and the cells would start dying after we stopped breathing for just 3 minutes.
In the whole human body there are 60000 miles of veins – that’s nearly 3 times the circumference of the world (circumference of the world is 24,901.55 miles)
So we have a lot of vein everywhere 😀 keeping us alive!
But did you know our brain is made up electrical activity, creating nearly 25 watts of power while you’re awake, which is enough to light up a light bulb.
I wonder if you could light a torch just by putting it on your ha, I wish we could