Taza termo

A nicely made box with the word birds on it. What can it be? And sure enough there's a bird there, and a flock of birds here. So, take the lid open and let's see what we can find....

The Gaussian Gun which I came across some ten years ago. Initially it reminded me of a Newton's Cradle with ball bearings which are going to move. But this is something quite different, there...

Here's a remarkable device that I came across in America a few years ago, and I'm so pleased to be able to have a sample to play with. It's called a True Mirror, and shows...