This link is a repost of the _Futurism_ article by Kyree Leary; probably worth linking to the original source: https://futurism.com/scientists-made-a-two-dimensional-mater...

:pedant:

Was anyone else off-put by the title and this introductory sentence? "The discovery? The creation of two-dimensional materials no thicker than a few atoms — something that's never been seen before in nature."

Two-dimensional space: Length * Width

Three-dimensional space: Length * Width * Height

If the material has thickness, as this material does (even if it is microscopic), it has a non-zero value for the height, ergo it's a three-dimensional object.

/pedant