Have you ever wonder why every time you open a brand new can of tennis balls you hear a pop! sound?Tennis balls come in four speeds, three types of felt and two basic means for producing bounce...

Jim Gates on String Theory from SciJourn Video on Vimeo.  Hits: 478   Read Comments (1)

Now there is a device to detect the sinkhole that can eat your car, the broken pipe that can pollute your neighborhood and even the secret tunnel running under the border. Entech Engineering Inc....