Tiny carbon tubes can be used to hide three-dimensional objects from view, according to a team of researchers.

BBC: Carbon nanotubes experiment results

But so is verifying anyone's identity in a world where even three-dimensional objects like Stradivarius violins can easily be "printed", let alone copied en masse.

ECONOMIST: Fake ID cards

Three-dimensional objects are what always made him tick.

FORBES: Magazine Article

The process turns digital models on computer screens into three-dimensional solid objects using plastics and other materials.

WSJ: Public-private partnership pushes '3-D printing'

Which of these objects is three-dimensional: rhombus, cylinder, or trapezoid?

CNN: Newsquiz: Week of December 31