If you’ve looked in your utility drawer lately, you may have noticed the various shapes, sizes and types of batteries that power your electronic devices. First, there are the round, non-rechargeable ...

Frog and toad pupils come in quite the array, from slits to circles. But overall, there are seven main shapes of these animals’ peepholes, researchers report in the Aug. 25 Proceedings of the Royal ...

Plans and elevations are 2D drawings of a 3D shape when looked at from different perspectives. Isometric close isometricA method of drawing a 3D shape from a specific perspective. dot paper is used to ...