Bumbling bank janitor Ernest P. Worrell is assigned to jury duty, and soon finds himself in trouble when he is covertly switched with a look-a-like...
The Office of Scientific Investigations tracks down the source of increased magnetism and radioactivity in Los Angeles, and discovers that a man-made...
A series of demonstrations that illustrate some of the scientific principles involved in magnetism.
免费无限访问, 搜索没有广告, 每天都有数以百万计的标题和添加, 所有平台和全面优化, 随时随地