Editor’s Note: Published in 1956, this article proved so popular that it served as the inspiration for Martin Gardner’s legendary Scientific American column Mathematical Games. Read more in our ...

3D shapes can be made from 2D shapes called nets. Watch the video to learn how 3D shapes, such as a cube, can be created from nets, an arrangement of 2D shapes. Let's talk about nets. More ...

A batwing sleeve is a long loose sleeve which is cut one with the bodice and has a deep armhole tapering to a tighter sleeve hem. This is a shrug with that beautiful and comfortable sleeve and an open ...

Abstract: In this paper a theory of two-dimensional moment invariants for planar geometric figures is presented. A fundamental theorem is established to relate such moment invariants to the well-known ...

Mandarin collar has many names – most of them Asian – like Korean Collar, Chinese Collar, Nehru Collar, Mao Collar. It is basically a band collar which is very elegant. The collar looks great on ...

This tool allows you to create any geometric shape imaginable. Squares, triangles, rhombi, trapezoids and hexagons can be created, colored, enlarged, shrunk, rotated, reflected, sliced, and glued ...

A set of Jupyter notebooks for learning Cheminformatics. The links below will open the tutorials on Google Colab. This way you can run the notebooks without having to install software on your computer ...