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| 1820 |
| | | French physicist André Marie Ampère begins his researches into the links between electricity and magnetism | |
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| 1821 |
| | | French physicist Augustin Jean Fresnel publishes the theory that light is a transverse wave, thus explaining polarization effects | |
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| 1822 |
| | | Egyptian hieroglyphs are deciphered by French Egyptologist Jean François Champollion, using the Rosetta stone | |
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| 1827 |
| | | German physicist Georg Simon Ohm formulates his law about the proportionality of current flowing in an electric conductor | |
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| 1828 |
| | | William Burke and William Hare murder 16 victims and sell their bodies to the Edinburgh Medical School for anatomical study | |
|  | Execution of William Burke
Wellcome Library, London
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| 1831 |
| | | HMS Beagle sails from Plymouth to survey the coasts of the southern hemisphere, with Charles Darwin as the expedition's naturalist | |
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| 1832 |
| | | English scientist Michael Faraday reports his discovery of the first law of electrolysis, to be followed a year later by the second | |
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| 1832 |
| | | English mathematician Charles Babbage builds a sophisticated calculating machine, which he calls a 'difference engine' | |
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| 1832 |
| | | The USA suffers the first of several cholera epidemics, spanning the sixty years to 1892 | |
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| 1835 |
| | | French zoologist Félix Dujardin identifies protoplasm, the viscous translucent substance common to all forms of life | |
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