Money is peculiar stuff. It has no use of any kind apart from its value in exchange for something else, and this grows over time as it earns interest, or shrinks as inflation overtakes it. If you have money to invest, there are a bewildering array of different kinds of financial instrument available: interest-bearing accounts, bonds, pension funds, stocks and shares, options ...
The very fetching purple and yellow packaging states that this is "the" interactive geometry software. A little optimistic, perhaps; The Geometer's Sketchpad and Cabri both have their - not insubstantial - followings. And the previous release of Cinderella gave the impression of a terribly well-featured package lacking slickness. But therein lies the value of Version 1.2: slickness.
The golden section (or golden ratio), famously, was used in antiquity, when the ancient Greeks built temples the proportions of whose parts - by accident or design - are often supposed to have fallen in the golden ratio.
It's worth pointing out right at the start that this wouldn't be a particularly good choice of calendar if you actually want to keep track of the year. The calendar is large (A2 size) but the days of the month occupy only a 1cm-high section of each page - and the day names aren't even included, just their numbers.
The author says in the introduction that "this book is intended as a polemic", and a polemic it certainly is. Whether or not you like the book will therefore depend not only on whether you agree with his thesis, but also on whether or not you like polemic.
I wish to God these calculations had been executed by steam."
With these words, spoken in 1821, Charles Babbage embarked on the great quest of his life - the attempt to fully automate calculation. Goaded by the all-pervasive errors in the tables of the period, he began to conceive of a great machine that would replace human fallibility with utter mechanical reliability.