A dentist in London cracked the secret of how Leonardo da Vinci placed a perfectly proportionate human figure sketch inside a ...

The fact that da Vinci was using this shape in a drawing sketched in 1490 drawing reveals his genius understanding of the human body centuries before modern science came along, Dr Sweeney argues.

This geometric figure — first identified by dentist William Bonwill in 1864 — is formed by connecting the two points where ...

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