Show HN: Boing(boing.greg.technology)

688 points by gregsadetsky 11 months ago | 135 comments

An interactive web toy showing a red ball on a spring that you can pull and release to make it boing, with a counter of boings.

Collision Detection (2015)(jeffreythompson.org)

207 points by todsacerdoti 2 years ago | 79 comments

λ Snap – An inviting programming language for kids and adults for CS study(snap.berkeley.edu)

176 points by dr_kiszonka 1 month ago | 112 comments

Scissors Congruence: An interactive demo of the Wallace–Bolyai–Gerwien theorem(dmsm.github.io)

36 points by signa11 3 years ago | 2 comments

Desmos Animated Graphing Calculator(desmos.com)

200 points by sonicrocketman 1 year ago | 35 comments

Body Doubling(bodydoubling.com)

117 points by yamrzou 1 year ago | 74 comments