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British crystallographer, pacifist, and prison reform activist Kathleen Lonsdale was born #OTD in 1903.

She proved, in 1929, that the benzene ring is flat by using X-ray diffraction methods to elucidate the structure of hexamethylbenzene. She was the first to use Fourier spectral methods while solving the structure of hexachlorobenzene in 1931.

https://en.wikipedia.org/wiki/Kathleen_Lonsdale

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