No, not what you might be thinking.
Hitting a golf ball. Or, in the lab frame, a golf ball hitting a surface. At 150 mph (about 250 kph).
Ah, those sweet curvaceous normal modes.
For me the first few frames are wonky, so for completeness here’s a gif of the same footage
The required reading/viewing apparently did not include the Tacoma Narrows Bridge for the Russian engineers who built this
The bridge across Volga river is 1260 meters long and 32 meters wide. It was opened less than a year ago in October 2009.
It was yesterday. Oh, well.
Rachel Maddow interviews Tom O’Brian, who is the head of NIST’s Time & Frequency division.
Kinda funny (to me) to hear O’Brian to continually use English units in his examples.
Please excuse the funkiness of the first couple of seconds. I don’t know what caused that.
I don’t know what species this is, but it’s pretty much the perfect slo-mo subject: flapping furiously but the center-of-mass is not moving very much, and didn’t fly away at my approach. I missed an even better shot while I was unslinging my camera; two of these butterflies were doing some sort of aerial ballet — either a mating ritual or fighting (or maybe both), but separated just as I got set to shoot.
Taken at Conway Robinson Memorial State Forest in Virginia.
What’s that spell? N-S-F-W ! (NSFW if you have the sound on, that is, but since it’s a song you sort of lose the effect if you mute it)
The Casual Mafia: MoFo Scientist
He’s a MoFo chemist or biologist. Not a lot of MoFo physics. (And no MoFo snakes on the MoFo plane.)
50 historical speeches available online
You hope that your professors will be good speakers who can keep your interest for at least the length of a class period, but more often than not, you’ll have a teacher or two each semester who drones on and on and doesn’t make you feel passionate about the subject. They could take tips from these speakers who have inspired thousands or even millions of people around the world, some even long after they’ve died. Here are 50 incredible, historical speeches you should watch online.
No time is wasted. The bullet train is moving all the time. If there are 30 stations between Beijing and Guangzhou , just stopping and accelerating again at each station will waste both energy and time.
A mere 5 min stop per station (elderly passengers cannot be hurried) will result in a total loss of 5 min x 30 stations or 2.5 hours of train journey time!
A 5-min stop is actually a longer delay owing to the time spent accelerating.
Smartphone Domino Machine
