The narwhal tusk, a “mythological horn” that was thousands of years ahead of materials engineering
Un estudio descifra la alargada espiral que emerge del cráneo de estos unicornios marinos, formada por dos capas dentales que crecen en sentidos opuestos y le confieren gran resistencia
We haven't written up this one. El Pais has the full story — the link below goes straight to it.