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 |
| 7503650 | Glow in the dark, heat sensitive color changing ear pieces or nose rest A set of eyeglasses wherein the nose rest and/or earpiece changes color when exposed to body heat. The nose rest and/or earpiece may contain a thermochromic material that is brightly colored and/or glow in the dark when not being worn and then when the eyeglasses ar... | 03/17/2009 |
| 6278938 | Method of processing waypoint data for travel guide device A travel guide device includes a GPS receiver for determining a present location. Access to a database of points-of-interest, indexed by GPS location, is provided to permit timely presentation of audio narration or visual display of information relevant t... | 08/21/2001 |
