◆ On this day

June 15

4 sourced moments from June 15 in history: King John sealed Magna Carta on 15 June 1215 — it lasted 10 weeks; The first human blood transfusion used a lamb, in 1667; Arkansas Became the 25th U.S. State (1836), plus 1 more.

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4 things happened on June 15

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1844 Science · Chemistry

Charles Goodyear patented vulcanized rubber in 1844

Goodyear's 1844 patent tamed rubber, but the stove 'accident' is only half the story, and a British rival patented it first.

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1836 Geography · Borders & Maps

Arkansas Became the 25th U.S. State

After a marathon debate over slavery, Arkansas slipped into the Union on a single signature in June 1836.

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1667 Human Body & Mind · Medicine & Disease

The first human blood transfusion used a lamb, in 1667

In June 1667 a Paris physician piped lamb's blood into a feverish teenager. He survived, but within months the experiments ended in scandal.

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1215 History · Medieval

King John sealed Magna Carta on 15 June 1215 — it lasted 10 weeks

Sealed at Runnymede, annulled by the pope within weeks, and not even called Magna Carta until 1217 — yet three clauses are still law.

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