100% verified The same day, three eras.

28 February

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Contemporary era

1986

Assassination of Olof Palme

On 28 February 1986, Swedish prime minister Olof Palme was assassinated in a Stockholm street.

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Typographic plate: Assassination of Olof Palme.
Author : Illustration composée par Éphéméris (CC0) Source du fait sur Wikipedia Licence : CC0 Illustration composed by Éphéméris (CC0). Historical source of the fact linked above.

Contemporary era

1953

The DNA double helix

On 28 February 1953, Watson and Crick determined the double-helix structure of DNA at Cambridge.

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Typographic plate: The DNA double helix.
Author : Illustration composée par Éphéméris (CC0) Source du fait sur Wikipedia Licence : CC0 Illustration composed by Éphéméris (CC0). Historical source of the fact linked above.

From the Middle Ages to the Enlightenment

1638

The Scottish National Covenant

On 28 February 1638, thousands of Scots signed the National Covenant against Charles I's religious reforms.

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Typographic plate: The Scottish National Covenant.
Author : Illustration composée par Éphéméris (CC0) Source du fait sur Wikipedia Licence : CC0 Illustration composed by Éphéméris (CC0). Historical source of the fact linked above.