When is a mountain no longer a mountain? When it becomes a hill. Sound strange? Read on. A mountain is a large land form that stretches above the surrounding land in a limited area, usually in the form of [more…]
Around Easter in 2017 I got hold of Warlord Game’s skirmish game set in ancient Japan, Test of Honour, bit of a bolt from the blue really. Bought it as much to support my local [more…]
More information on laser speckle can be found here: Speckle pattern A Mirror Alignment Tool The most important part of constructing a ruby laser (or any laser with external mirrors) are getting the mirrors alligned [more…]
“Rise above oneself and grasp the world” These are awarded every four years for advancement in the field of mathematics. There is an age limit of 40 on the recipients. It is a recognition of [more…]
Euler’s totient function counts the number of positive integers up to that are relatively prime to , where is considered to be relatively prime to all . These numbers are called the totatives of . [more…]
In the comments which nobody reads I often post photos of my parrots. In some photos I’ve posted they’re eating chillies. Some people have asked why I feed my birds hot chillies every day and [more…]
(a ruby rod lit by two bright blue LEDs. Due to the IR filter in my camera the pink colour is actually red. What you are seeing is the absorption of the blue light and the [more…]
The Brecon Beacons Visitor Centre, known locally as the Mountain Centre, is not far from the village of Libanus as you drive up the A470 towards the town of Brecon. The drive up itself is [more…]
A Puffin asked in the comments recently if someone could do a post on this, as he had always been interested in having a go at them but didn’t know where to start. So here [more…]
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