Did You Know...
...that Kleenex tissue was originally designed to be a gas mask filter? It was developed at the beginning of World War I to replace cotton, which was then in short supply as a surgical dressing.
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| Number | Title | Issue Date |
| 4235737 | Method for treating radioactive liquids A process for treating and handling radioactive liquids and rendering such liquids safe for handling, transportation and disposal, the process comprising adding thereto a small amount of a water-insoluble alkali salt of an aqueous alkali saponified gelati... | 11/25/1980 |
