Just about everybody has heard of the Twin Paradox in relativity: one twin becomes as astronaut and sets off for Alpha Centauri, the other remains on Earth at mission control. Thanks to time dilation, the two age at different rates, and the one who made the trip out and back ends up younger than the… Continue reading Physics Quiz: Accelerated Twins
Tag: physics
Laser Smackdown: Amazing Laser Applications
Last week, I asked for nominations of the most amazing laser application, with the idea being that I will collect a list, write up the top vote-getters in a series of blog posts, and then we will have a vote to determine what is THE coolest laser application of ALL TIME! At least, you know,… Continue reading Laser Smackdown: Amazing Laser Applications
Quantization of Books 4: How Many Books Is That Again?
I’ve toyed around in the past with ways to use the Amazon sales rank tracker to estimate the sales numbers for How to Teach Physics to Your Dog. It’s geeky fun, but not especially quantitative. Yesterday, though, I found a reason to re-visit the topic: calibration data!
The Popular Science Writing Process
Via SFSignal’s daily links dump, Lilith Saintcrow has a terrific post about the relationship between authors and editors: YOUR EDITOR IS NOT THE ENEMY. I don’t lose sight of the fact that I am the content creator. For the characters, I know what’s best. It’s my job to tell the damn story and produce enough… Continue reading The Popular Science Writing Process
Theoretical Particle Physics Is Always in Crisis
Dennis Overbye is a terrific writer, but I have to say, I hate the way that he falls into the lazy shorthand of using “physics” to mean “theoretical particle physics” in this article about a recent conference built around debates about the state of particle physics. He’s got lots of great quotes from Lisa Randall… Continue reading Theoretical Particle Physics Is Always in Crisis
Icarus at the Edge of Time, by Brian Greene
Or, Brian Greene Writes a Kid’s Book… This is a very odd book. It’s printed on boards, like a book for very small children, but the story is a bit beyond what I would imagine reading to a normal kid of the age to want books of that format. It’s too short and simple, though,… Continue reading Icarus at the Edge of Time, by Brian Greene
Subtracting Photons from Arbitrary Light Fields
There’s been a fair bit of press for the article Subtracting photons from arbitrary light fields: experimental test of coherent state invariance by single-photon annihilation, published last month in the New Journal of Physics, much of it in roughly the same form as the news story in Physics World (which is published by the same… Continue reading Subtracting Photons from Arbitrary Light Fields
The Football Positioning System
It’s NFL playoff time, which means that sports fans will be treated to the sight of the most high-stakes farce in sports, namely the ritual of “bringing out the chains” to determine whether a team has gained enough yards for a first down. We’ve all seen this: the play is whistled dead, a referee un-stacks… Continue reading The Football Positioning System
Official Neil B Quantum Measurement Thread
I’m a little cranky after a day of reviewing grant proposals, so it’s possible that I’m overreacting. But commenter Neil B has been banging on about quantum measurement for weeks, including not one, not two, but three lengthy comments in Tuesday’s dog post. For that reason, I am declaring this post’s comments section to be… Continue reading Official Neil B Quantum Measurement Thread
The Age of Entanglement by Louisa Gilder
I made a run to the library last week on one of the days I was home with SteelyKid, as an excuse to get out of the house for a little while. I picked up three books: Counterknowledge, The Devil’s Eye by Jack McDevitt (an Antiquities Dealers Innnnn Spaaaaaace novel, and a good example of… Continue reading The Age of Entanglement by Louisa Gilder