There's a relatively new development in cars that I've never quite understood: start-stop systems.
That's when stopped cars - at a red light, for example - automatically turn their engine off and start up again when the driver tries to get the car moving again. According to this video - which cites research articles - it only takes about seven seconds of idling to use up more fuel than it takes to simply turn the car off and restart it.
It's almost like engineers know what they're doing.
I've know the broad strokes of the mercury-hatter connection for a while but not the specific details and history that are retold in today's video.
Sounds like the hatter/Danbury shakes were a very early version of lack of workplace protections. The hatters might as well have been told to lick their radium paintbrushes.
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| Source - vintag.es |
The Royal Institution is a British group founded in 1799 and historically known for promoting and sharing scientific knowledge both within scientific circles and to the general public.
Since 1825 they have been putting on a series of Christmas lectures, many of the most recent of which have been recorded and posted on YouTube for us to see.
This video is the 2014 Christmas lecture going through a fair portion of the periodic table, telling stories about each one and helping us to understand a bit of their arrangement along the way.
As promised last week, here's the first Veritasium video about thermite.
I'm not thrilled that Dr Derek's titles seem to be getting more clickbaity and less informative. Again this week, the video's title isn't really what the video is about. It's a minor part of the video - here addressed in about six minutes in the middle of the video - and doesn't really cover the bulk of the video's content.
With that being said, seeing thermite in slow motion and through glass is pretty stunning.
Great video...bad title...
The title of this video - which might change since I'm writing this up just a day after it was posted to YouTube - is a bit misleading. The actual question in the title - why don't railroads need expansion joints - is only answered in the last half minute or so of the video and is answered more thoroughly in a Practical Engineering video that I'll post after a jump.
The bulk of the video is spent explaining how railroad welds using thermite work. The video explains the nuances far better than other thermite videos I've posted before, explaining why the rails must be aligned and peaked, why the rails must be preheated (including a nice demonstration of heat treating), how the crystal structure changes as a result of the weld, and eventually why the rails don't need expansion joints.
This is the second of at least three thermite videos from Dr Derek. I thought I'd posted the first video to both blogs, but I can't seem to find it, so it'll likely show up next week.
I've posted about plasma before, specifically from Veritasium. That video does a great job explaining why halved grapes - and other similarly sized, primarily water objects - can create plasma in a microwave oven
Today's video looks at why plasma can be created from non-water systems like matches under an upside-down beaker, something I've tried before and can verify the ease of it working.
Just to protect myself legally, don't try this at home. Be smart, folks.
#forbiddenfrosting
Most hand manufacturing processes are stunning to watch, and in this case it apparently produces a product that is superior to mass manufactured competitors. It has to be way more expensive and time-consuming, though.
So pretty...so mesmerizing...so colorful...
