Dmitri Mendeleev presented the first periodic table.
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The first successful administration of insulin to treat diabetes was given to 14-year-old Leonard Thompson.
The BBC broadcast the world's first science fiction television program, an adaptation of the play R.U.R.
The discovery of the chemical element Neptunium was announced.
A Texan doctor performed the world's first successful partial skull and scalp transplant.
New York became the first US court to allow blood test results to be used as evidence.
