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- This is a timeline of the history of hydrogen technology. c. 1520 – First recorded observation of hydrogen by Paracelsus through dissolution of metals...25 KB (2,631 words) - 09:00, 9 May 2024
- A watergate (or water gate) is a fortified gate, leading directly from a castle or town wall directly on to a quay, river side or harbour. In medieval...2 KB (99 words) - 22:06, 11 May 2024