The 4D printing concept draws inspiration from nature which already has the ability to self-replicate.

BBC: TED 2013: 4D printed objects 'make themselves'

One is its ability to create large pools of potential partners that would be hard to replicate in the real world.

ECONOMIST: Online dating

Much of the drug development centers on stopping hepatitis C's ability to replicate.

FORBES: Magazine Article

HIV's ability to replicate (known technically as its virulence) may have decreased since the start of the pandemic.

ECONOMIST: In one part of Europe, HIV may be getting less virulent