Swans on Tea

No, not of an alien at the window.
Here’s a little movie showing atoms being trapped and mistreated. What you’re seeing is a video of the monitor that’s hooked up to a little IR camera on the vacuum chamber. The really bright spot that’s squirming around a little are the atoms, or technically, the [...]

International Experiments In Relative Motion
Cute video of a Japanese demonstration to show relative motion. Get a mini-pickup to go 100 kph, and mount a ball-launcher on the back, that can shoot a ball out the back at 100 kph. Film it and confirm the Galilean transformation. They would have gotten bonus points [...]

A few weeks ago, over at Built on facts, I threw Matt a bit of a knuckleball in the comments.
[C]onsider a solid bar of the same index [as water]. You send in the pulse of light (assume a really good AR coating so there’s no reflection). What happens to the speed of the bar?
This was [...]

There’s a video out there in the ether that purports to measure time dilation in a car. I’ve already shown that this can, and does, happen, but you need to have some pretty expensive toys at your disposal to make the measurement.
For a good experiment (I’m perhaps charitably assuming this wasn’t just an out-and-out [...]

I was poking around the toobz (looking for a citation or link to something about “slow light”) and ran across this press release from last year that made me clench and then start grinding my teeth. I have no idea who vets these things, but OMFG, it’s bad. The press latches onto these [...]

Electrons and photons in a Mach-Zehnder interferometer show differences in their behavior
The output signal hit a minimum every time the two electron waves cancelled and a maximum when the waves maximally reinforced one another. But as they increased the current, the interference pattern waxed and waned in amplitude in an unexpected way, disappearing altogether at [...]

Zapperz, back from vacation, notes that Willis Lamb passed away recently. The Lamb shift, the energy splitting of the 2s and 2p states of the hydrogen atom, was a huge confirmation of quantum electrodynamics and garnered him the Nobel prize, and you can read more about that here. But that’s not the only [...]

Oh, wait. It’s the other drag coefficient.
Measure Your Car’s Drag Coefficient!

The other thing that struck me about bait-and-switch was this
I gravitated toward a scientific life with fantasies of sci-fi movies running through my head, with large machines emitting lightning at the flip of a huge Frankenstein-type switch, or several people poring over softly-glowing computer screens as an experiment produces fantastic data in real-time, and [...]

The topic comes up, as it sometimes does, of the mass-energy equivalence from relativity. There are different tangents to this — what does the equivalence really mean, can you really turn energy into mass, does a photon have rest mass, what is the difference between relativistic mass and rest mass, and is the use [...]

Classic Science Paper: Otto Wiener’s experiment (1890) at Skulls in the Stars.
By 1890, then, scientists were interested in seeing whether similar results held for light waves: it seems that a number of scientists remained unconvinced that light truly was just another manifestation of electromagnetic waves! One big obstacle stood in the path of such studies: [...]

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