New PDF release: ABC of Relativity
By Bertrand Russell
First released in 1925, Bertrand Russell’s ABC of Relativity used to be thought of a masterwork of its time, contributing considerably to the mass popularisation of technological know-how. Authoritative and available, it offers a amazing introductory advisor to Einstein’s conception of Relativity for a basic readership. essentially the most definitive reference publications of its type, and written via one of many 20th century’s such a lot influential philosophers, ABC of Relativity is still as suitable at the present time because it was once on first publication.
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Extra resources for ABC of Relativity
Again, one would think that the invention of buttons enabled us to develop today’s clothing, but in fact it was the unknown 13th-century inventor of the buttonhole which allowed this. UNKNOWN HEROES OF SCIENCE Even when we come to ‘known’ inventors or discoverers, sometimes they are ‘standing on the shoulders of giants’, following on from a long line of original thinkers. In other cases, the wrong inventor has been attributed because he or she was better at innovating or marketing, or simply better-known.
Alpha and beta in turn came from the first two letters of the Phoenician alphabet, and meant ox and house (early man’s two most important possessions) respectively. The Greeks borrowed the Phoenician alphabet and adapted it to their own language. The letters of the Greek alphabet are the same as those of the Phoenician alphabet, and both alphabets are arranged in the same order. The Greek adapter of the Phoenician system also added three letters to the end of the series, called the supplementals.
This meant that the material that money itself was made of no longer had to be very valuable. To guarantee its value, this representative money was therefore backed by a government or bank’s promise to exchange it for a certain amount of silver or gold, whenever required. For example, the old British pound bill or pound sterling was once guaranteed to be redeemable for a pound of sterling silver. CATTLE AND CHATTEL THE WORD ‘cattle’ comes from the Old French/Norman-Picard chatel, and when used in English as chattel had the meaning of personal property.
ABC of Relativity by Bertrand Russell