We to-day know that there is a direct relation between the moon and tides. When Julius Cæsar went to conquer Britain his transports were wrecked because he did not know the tides on the English coast; a knowledge of which might have changed the whole course of history. (Volume 30, Harvard Classics)
Kelvin delivers lecture on "Tides," Aug. 25, 1882.

Introductory Note: Sir William Thomson (Lord Kelvin)

Former President of Harvard University Charles W. Eliot wrote in his introduction to the Harvard Classics, "In my opinion, a five-foot shelf would hold books enough to give a liberal education to any one who would read them with devotion, even if he could spare but fifteen minutes a day for reading." Here you are, you can easily listen to his entire 15-minutes-a-day study guide while commuting to and from work (most of us spend far more than 15 minutes a day commuting each day), doing mundane work in the office, washing dishes at home, or doing most of the things day in and day out. It is so easy, so entertaining, and so educational that they can be listened to again and again, until they permeate into our own thinking and into our characters. Perhaps, in one year's time, you will become someone you barely recognize, all for the better. Who knows?-- Rich E Book