Tuva

Richard Feynman, Corrected


A while ago, Vladimir Putin was shown on Russian television cavorting around Kyzyl, Tuva. (The same Tuva after which Microsoft named its excellent Tuva Project). Tuva was made famous in the physics world in 1991 by the publication of "Tuva or Bust, Richard Feynman's Last Journey"... At the time, the Tuva media attention caused me to dust off and re-read that book...leading, interestingly enough, to the discovery of a previously unknown, but unfortunately somewhat widely propagated, Feynman error. Yeah, Feynman published an error. So here is the story, along with my correction...
Hamilton

Hamilton







Recently, I talked to somebody who mentioned they had worked with coordinate systems and gimbals, which reminded me I have a backlog of old blog entries that have not been ported to .Net core... Here then is the port of an old post, on the great William Rowan Hamilton, quaternions, and gimbal lock...


gauss

Complex Numbers


Our ultimate goal is to explain, simply, how the classical idea of a bit -- something that can have a value of only zero or one -- may be extended to a quantum system. Because quantum mechanics uses "complex numbers", it is natural to start there...

Quantum Bits


The quantum analog of a two valued sytem gives rise to the idea of a quantum bit, also known as a qubit.

Orion and Mars


Sometime ago, NASA launched its Orion rocket, with the goal of sending man to Mars. A cost and benefit analysis is interesting...

Magic of Reality Review


A review of Dawkins' work that he wrote for a younger audience. A careful analysis of Dawkins' work is given. Dawkins' book utlimately turned out to be a missed opportunity for Dawkins.