What's Pi Day all about? Math, science, pies and more
Simply put, pi is a mathematical constant that expresses the ratio of a circle’s circumference to its diameter. It figures into numerous formulas used in physics, astronomy, engineering and other ...
Trains on MSN2d
Selecting the right wire size
Q: I’m setting up a model railroad on a 6 x 12-foot table. The layout will use Digital Command Control. What would be the ...