bodmas blog

50 questions at level 1 and 2 on Number

Tinderbox – soon for Windows – is worth the money, deep software

Use a spreadsheet to write each idea in a cell with a heading….

This tomb shows a very scary painted figure and an old style horroscope. The place must have looked totally different when the walls were polychrome murals and lit entirely by candles….

When photographers include the Moon or Sun in a picture, you can find the angle of view and the focal length of the lens by a simple application of trigonometry.