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An investigation mystery.
Presenter is Dr. Peter Dourmashkin.
So which hand does he favor? Right hand. Look how he writes on the chalkboard at 3:58 in the following video.
8.01x - Lect 24 - Rolling Motion, Gyroscopes, VERY NON-INTUITIVE - YouTube[^]
So with the video from the OP...starting as 0:32 (and 2:05) seconds in he writes on the screen.
He is using his left hand.
Also if you look at 0:08 he is also gesturing with his left hand.
One might claim that he is just ambidextrous but it seems unlikely that he would gesture like that also.
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Wordle 931 2/6
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In a closed society where everybody's guilty, the only crime is getting caught. In a world of thieves, the only final sin is stupidity. - Hunter S Thompson - RIP
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Wordle 931 6/6
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Just managed.
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Wordle 931 5/6
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βThat which can be asserted without evidence, can be dismissed without evidence.β
β Christopher Hitchens
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Wordle 931 6/6
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Ok, I have had my coffee, so you can all come out now!
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Wordle 931 5/6*
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1:01.27
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I know some (many?) of you cook, and I know we are a transnational group - might be the wrong term - how about global community. I'm interested in your kitchen. One disease I *had* in my home for decades is the lack of a proper range vent. You know, one of those things that when you turn it on, it vents stuff to OUT of the house. Around the late 70s in the US, house designs went cheap or bat crap stupid - you pick. Instead of venting range gases to the exterior, they "filtered" them and put it right back in the house. This might have been driven by trying to make houses more energy efficient, I honestly don't know.
Years later, I came across Asian co-workers who had HUGE vents (industrial grade) in their kitchens. I am certainly not judging as I love fried rice, but it made me start thinking about this venting issue. My house was built in 1988, and I have the blessing of a "whole house fan." Open a few doors and windows and this will ventilate your house in 10 minutes. I treasure it. Please keep in mind that with the # of children I've raised and am raising (10+ grand kids at the moment, not all are here), 100% efficiency went to hell and a hand basket a long time ago.
A few years ago, I redid my kitchen, and my mandate was - real vent fan. I'm interested - from across the world - are these normal? Also - do you cook on gas or electric? Up until 3 yeara ago, I was always electric. Take my gas range, and I'm going John Simmons on you.
Happy New Year and may you be blessed.
Charlie Gilley
βThey who can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety.β BF, 1759
Has never been more appropriate.
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My experience has been fans that vent to the exterior unless this was impossible or the architect was so stupid as to come up with a floor plan where it could have been done but wasn't.
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may i say i am w/ the wokes on this one . must be electric probably induction (most modern perhaps most efficient certainly easiest to clean) as gas fumes are not meant to be inhaled . by the way who is this John Simmons of which whom you speak .
modified 6-Jan-24 1:46am.
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BernardIE5317 wrote: by the way who is this John Simmons of which whom you speak .
Long time CP member, known due to his love to guns and gas / petrol among others.
M.D.V. 
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.
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Nelek wrote: due to his love to guns and gas / petrol among others.
Freedom and individual liberty
The difficult we do right away...
...the impossible takes slightly longer.
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Aussie here. I have seen recirculating ones, but not in any of the houses I have lived in, mercifully.
One house in Melbourne my parents owned had the gas stove under a chimney, (where the old fireplace would have been). Natural convection, no fan.
I've always had electric, currently separate underbench oven and glass cooktop under the extractor hood. My mother cooked on gas for many years.
This 108 year old house (remodelled a few times over the years) still has the "old kitchen" with an AGA Rayburn 510 wood burner, fully functional, thought the wetback has long been disconnected. My main problem using it is keeping the heat down. It's ridiculously efficient, and I'm used to feeding a fire to warm the whole house.
Software rusts. Simon Stephenson, ca 1994. So does this signature. me, 2012
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I have a ceramic hob - the same easy-to-clean as induction, but way cheaper to buy. Not as efficient though.
We have no choice here: mains gas doesn't come out this far, and we can't have bottled gas for physical reasons so the whole house is electric only (and guaranteed by the supplier to be 100% Green Electricity*)
The vent is a charcoal filtered "internal" jobbie which is pretty useless but understandable given the house walls are 2ft thick granite so getting a vent through would be ... expensive and time consuming! 
The oven I don't use much at all any more: it's much more efficient to use one of my air fryers instead.
* Which is of course total bollocks: electrons are electrons. And Mr Shell Energy, if it's Green and "all renewable sources", why the **** does the worldwide price of gas / oil make it double the price it was?
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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Always amazes me when I watch "Escape to the country" how thick the walls of English cottages are 
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They were built to last! 
"I have no idea what I did, but I'm taking full credit for it." - ThisOldTony
"Common sense is so rare these days, it should be classified as a super power" - Random T-shirt
AntiTwitter: @DalekDave is now a follower!
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Induction cooking and real vents to the outside are fashionable over here in the Netherlands. When we visited a relative last week who showed us his new kitchen, we were surprised to see an extractor hood of the filtering kind.
The newest trend are "Bora" like extractors that are built into the cooktop.
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I had my kitchen extended a few years ago and one 'must have' was a cooker hood / extractor / vent to outside. Kitchen was designed around this to millimetre accuracy (so we could still use standard size units). We have a dual gas/electric range, with gas hob, oven and grill and a second fan electric oven. Very pleased with what we ended up with.
We also have a second property which we've not altered, which has a gas hob. Cooker hood over but recirculates (wrong side of kitchen for external wall). Never really noticed that it makes any difference between on or off ... π
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Indian here, never heard of a "range vent" but it's known as an electric chimney.
Very rare, except in maybe new and rich homes. The vast majority, including me, use an exhaust fan like this https://www.amazon.in/Havells-Ventil-230mm-Exhaust-FHVVEMTBRN09/dp/B091FBFFMM It's very simple, not as thorough as an electric chimney, but it picks up air from the immediate vicinity and pushes it outside.
Cheers,
Vikram.
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electric chimney - interesting. It fits.
Charlie Gilley
βThey who can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety.β BF, 1759
Has never been more appropriate.
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Around here, a range hood [^] is standard in every house. It's just an exhaust fan housed in a fancy hood over the cooker, price depending on the design.
There are also a fan that vent all the air in the house, but it's only found in relatively new buildings. That's usually an exhaust fan in the bathroom wall or ceiling, with inlet vents built into walls of all rooms.
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Our apartment has the microwave mounted above the stove (electric) and that provides the filtering you mention.
Past apartments have had the microwave vent to the outside.
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Gas, and I never use the vent fan. Seems pointless. It's at least two feet above the burners and has no suction, so I can't imagine it vents anything. And my house (100 years old) is rather porous anyways and I as you say, in the spring/summer, I have windows open. So do I care if I'm possibly going to die from harmful PM 2.5 particles in 30 years given that I'm 61? No, not really. 
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charlieg wrote: Take my gas range, and I'm going John Simmons on you
Amen, brother! We have a gas range with an electric oven. It's the ideal combination. Instantly available and adjustable heat up top, well-controlled temperatures for baking.
Any anyone who makes sexist remarks about guys baking can ![Elephant | [mastadon]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/elephant.gif) right off. I have my mother's recipe for banana nut bread and I ain't sharin' with y'all.
Software Zen: delete this;
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I'm in the US. I had a filter-and-vent-inside range hood for many years and it did pretty much nothing. So I now have a vent to the outside hood, having rearranged my kitchen to allow it, but it hasn't been installed yet. I have always wanted a whole-house venting fan. Seems highly practical.
I have an electric range because I prefer baking with electric, but I would trade it in a heartbeat for a gas stovetop/electric oven combo. I may even go for total gas range since I'm no longer baking for a herd, having only a single adult child living with me and therefore making good use of my air fryer to bake smaller portions.
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