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|Centuries:||18th century – 19th century – 20th century|
|Decades:||1790s 1800s 1810s – 1820s – 1830s 1840s 1850s|
|Years:||1821 1822 1823 – 1824 – 1825 1826 1827|
- Heat was discovered to be transferred from hot to cold objects.
- Royal Society for the Prevention of Cruelty to Animals founded.
- Brauerei C & A Veltins brewery founded
- Thomas Jefferson University founded