To be sure, the carnivorous animals bolt their food, but they are tougher than we are, and do not carry the burden of a large brain and a complex nervous system.
"The Book of Life: Vol. I Mind and Body; Vol. II Love and Society"
Upton Sinclair
Remember that we and the disease germs are both cells; and that, if they are numbered by millions, we are by billions; and that we are made up of far the older and the tougher cells of the two.
"A Handbook of Health"
Woods Hutchinson
One of the mammoth cargo ships had been loaded with six inch flexible hose, tougher than steel, wound on drums.
"For Every Man A Reason"
Patrick Wilkins