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 |
| 7627526 | Third-party billing system and method A third-party billing system and method permits consumers to conduct e-commerce transactions (including microtransactions) securely and anonymously by providing billing and personal information to the third party billing system rather than to merchants. A consumer i... | 12/01/2009 |
| 7346577 | Third-party billing system and method A third-party billing system and method permits consumers to conduct e-commerce transactions (including microtransactions) securely and anonymously by providing billing and personal information to the third party billing system rather than to merchants. A consumer i... | 03/18/2008 |
