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 |
| 7814688 | Device for high-heeled shoes and method of constructing a high-heeled shoe A device for insertion in a high-heeled shoe has a first crescent shaped raised area in a region underlying the forward edge of a wearer's heel bone and a second raised area underlying the metatarsals of the wearer is described. Also described is a method for constr... | 10/19/2010 |
| 7594346 | Device for high-heeled shoes and method of constructing A device for insertion in a high-heeled shoe has a first crescent shaped raised area in a region underlying the forward edge of a wearer's heel bone and a second raised area underlying the metatarsals of the wearer is described. Also described is a method for constr... | 09/29/2009 |
| 7322132 | Device for high-heeled shoes and method of constructing a high-heeled shoe A device for insertion in a high-heeled shoe has a first crescent shaped raised area in a region underlying the forward edge of a wearer's heel bone and a second raised area underlying the metatarsals of the wearer is described. Also described is a method for constr... | 01/29/2008 |
