Alan Richmond

Author: Alan

Software engineer for more than 20 years with major scientific research projects, e.g: Hubble Space Telescope, NASA, European Southern Observatory, Joint European Torus, European Synchrotron Radiation Facility.

Solar System Scope

Solar System Scope

Online 3D simulation of the Solar System and night sky in real time – the Sun, planets, dwarf planets, comets, stars and constellations. The Model consists of 3 main Views (Heliocentric, Geocentric and Panaromatic), including:
• Precise Positions of all …

Logic Puzzles

By Cmglee (Own work) [CC BY-SA 3.0 (], via Wikimedia Commons
Logic, The Anatomy of Thought

Knaves and Knights

An island is inhabited by two classes of people: knights, who make only true statements, and knaves, who make only false statements. Three inhabitants are conversing. Alfred says, “All of us are knaves.” Bert says, …

Lateral Thinking Puzzles

Rodin's Thinker

Be prepared to think outside the box for these classic lateral thinking puzzles. Enjoy!

Three Switches and Three Bulbs

Three switches outside a windowless room are connected to three light bulbs inside the room. How can you determine which switch …