- The Lost Art of Logarithms (lostartoflogarithms.com)
An online book-in-progress by Charles Petzold wherein is explored the utility, history, and ubiquity of that marvelous invention, logarithms including what the hell they are; with some demonstrations of their primary historical application in plane and spherical trigonometry.
- Triumphal entry into Jerusalem (Wikipedia)
The triumphal entry into Jerusalem is a narrative in the four canonical Gospels describing the arrival of Jesus in Jerusalem a few days before his crucifixion. This event is celebrated each year by Christians on Palm Sunday.