Rediscovered letters and postcards highlight the fierce competition among scientists who discovered DNA's famous double-helix structure and unraveled the genetic code.

Described December 23 in the journal Science Advances, the software lets users take drawings or digital models of rounded shapes and turn them into 3D structures made of DNA.

The international team led by Cambridge University's Cavendish Laboratory used an advanced 3D printing technique they developed to create magnetic double helices -- like the double helix of DNA ...

Francis Crick and James Watson recreate their demonstration of the double helix model for DNA in 1990. (Image credit: Cold Spring Harbor Laboratory Library) ...