Rock Layers: Timeline of Life on EarthEvolution is a complicated subject. While everybody understands that black bears are related to grizzly bears and we can even figure they are related to extinct bears, lots of people wonder how scientists can be so su
Infographic: ElectricityA visual cheat sheet about electrical physics, containing the most important formulas of current and Ohm’s law expressed through an impossible water circuit analogy.(by Pierluigi Scotolati)
Easy To Make Stone Art - write message on rock with pencil, Use Dremel w/grinding stone, run over pencil mark once to create groove, go over three times or until you reach desire thickness. - now I just need a dremel.