The depths of Neptune and Uranus may be 'superionic'

The interiors of ice giant planets like Uranus and Neptune could be home to a previously unknown state of matter, according ...
BBC

2D and 3D shapes

Explore the properties of 2D shapes from one-sided circles to the eight-sided octagons. What makes a shape symmetrical? Find out what makes a shape symmetrical. Positions, directions and turns Learn ...