◆ On this day

February 28

3 sourced moments from February 28 in history: Nylon was first made on 28 February 1935 at DuPont; Photo 51 didn't hand Watson and Crick the double helix (1953); and Olof Palme's 1986 murder is officially unsolved again.

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3 things happened on February 28

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1986 History · Modern

Olof Palme's 1986 murder is officially unsolved again

Sweden named a dead man as Palme's killer in 2020; in December 2025 prosecutors withdrew that finding, leaving the assassination formally unsolved.

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1953 Human Body & Mind · Genetics

Photo 51 didn't hand Watson and Crick the double helix

The double helix was cracked in Cambridge in February 1953. The pub boast, the 'stolen' photo and Franklin's lost Nobel are messier than the legend.

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1935 Science · Chemistry

Nylon was first made on 28 February 1935 at DuPont

Nylon 6,6 was first made in 1935, but sources say 1930, 1935 or 1938. Each date marks a different step, and coal decided the winner.

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