I might add that our circulatory system, which has some 60,000 miles (100,000 km) of blood vessels, must be the envy of plumbing engineers, for it has the means to plug leaks and repair itself.
Inimese keha vereringesüsteem, milles on umbes 100 000 kilomeetrit veresooni, võiks tekitada kadedust igas torulukksepas, sest see süsteem suudab peatada lekked ning parandada ennast ise.