Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 7644551 | Double skin door apparatus A hollow core door comprises a perimeter frame, and first and second molded skins. Each skin has an exterior surface and an interior surface secured to opposing sides of the frame. At least one of the skins has an outer planar area, an inner planar area, and an asym... | 01/12/2010 |
