In the twenty-first century, the robot will take the place which slave labor occupied in ancient civilization.
I do not think you can name many great inventions that have been made by married men.
The spread of civilization may be likened to a fire; first, a feeble spark, next a flickering flame, then a mighty blaze, ever increasing in speed and power.
Instinct is something which transcends knowledge.
Most persons are so absorbed in the contemplation of the outside world that they are wholly oblivious to what is passing on within themselves.
Soon became convinced I was right and undertook the task with all the fire and boundless confidence of youth.