It’s all in an experiment by Mac · Published July 10, 2010 · Updated March 23, 2015 Work is progressing on episode one. The latest screen shot shows Professor Mac preparing to conduct an experiment to demonstrate Newton’s first law of motion.
0 Working on a spring balance October 29, 2011 by Mac · Published October 29, 2011 · Last modified March 23, 2015
51 What do scales measure? March 27, 2015 by Mac · Published March 27, 2015 · Last modified July 8, 2019
it is wonder full
Looking good.