physics and math

We are constantly immersed in magnetic fields. The Earth produces a field that envelops us. Toasters, microwaves and all of our other appliances produce…

Last December, a gloopy ooze of lava began extruding out of the summit of La Soufrière, a volcano on the Caribbean island of St. Vincent. The effusion was…

Let's suppose you need to measure the mass of some water, and you want to construct a scale to do it. But you are in a normal house filled with normal stuff.…