Shaped charge: very fast, very narrow jet of explosion
Thursday, August 2, 2018
Wednesday, August 1, 2018
Test-driving the new Fair used-car leasing app
So the "Fair" app is a way to lease a used car, short term (give 5 days' notice to return it) and you pay for repairs and normal wear and tear.
How to open a corn husk
Simple trick - watch from 1:39. As with all these kind of videos, could've been a 5 second video without all the self-promotion and filler.
How To Make Clear Ice
Make clear ice by freezing from the top down. But if that's the case, why aren't regular ice cubes clear at the top? Maybe they are, when you look closely at the "dirty" ice cubes near the beginning.
I had no idea it was so easy. (I thought it had to do with water quality, or filtration, or freezing thin layers or something.)
Tuesday, July 31, 2018
Drone is Designed to Save Lives Then Disappear
Cardboard disposable drone steers during free fall to a target, then decomposes - designed for dropping medical supplies in third world relief work.
100 Lowest Expense Ratio ETFs – Cheapest ETFs | ETF Database
A good place to start for retirement investments. If you want to have your money just follow the market, you will lose a lot less money to money managers in the long run with low expense ratios. For instance, on $50,000 an expense ratio of 0.4% is $200, while 0.03% is $15.
Monday, July 30, 2018
Why ISIS or terrorist can't attack in south Africa - Trevor Noah
Funny! Here's so good at maintaining your interest with a long drawn-out story.
Sunday, July 29, 2018
Learning to fly a helicopter can take 3 months of eight hour days. Changing one of your three controls requires simultaneous changes of the other two to maintain stteady flight.
https://www.youtube.com/watch?v=WdEWzqsfeHM&list=PLNbXXMoWfR3Bf7Z77vcviPlkHtTXUlEpC
Here's a tethered helicopter for teaching:
https://www.youtube.com/watch?v=WdEWzqsfeHM&list=PLNbXXMoWfR3Bf7Z77vcviPlkHtTXUlEpC
Here's a tethered helicopter for teaching:
https://youtu.be/vDnzpRVPCM4
Tom Cruise learned quickly in a crash course, and flew a complicated maneuver himself.
Tom Cruise learned quickly in a crash course, and flew a complicated maneuver himself.
Saturday, July 28, 2018
The Truth about Hydrogen and FCV
A thorough explanation of the inefficiencies from production to distribution to conversion to when the rubber actually hits the road. There's a lot to consider.
Why spend so much energy isolating hydrogen, only to turn it into electricity, when there is already a much safer and more efficient technology for storing electricity in batteries.
"fuel cell expert Ulf Bossel explains that a hydrogen economy is a wasteful economy. The large amount of energy required to isolate hydrogen from natural compounds (water, natural gas, biomass), package the light gas by compression or liquefaction, transfer the energy carrier to the user, plus the energy lost when it is converted to useful electricity with fuel cells, leaves around 25% for practical use — an unacceptable value to run an economy in a sustainable future."
https://phys.org/news/2006-12-hydrogen-economy-doesnt.html#jCp
Why spend so much energy isolating hydrogen, only to turn it into electricity, when there is already a much safer and more efficient technology for storing electricity in batteries.
"fuel cell expert Ulf Bossel explains that a hydrogen economy is a wasteful economy. The large amount of energy required to isolate hydrogen from natural compounds (water, natural gas, biomass), package the light gas by compression or liquefaction, transfer the energy carrier to the user, plus the energy lost when it is converted to useful electricity with fuel cells, leaves around 25% for practical use — an unacceptable value to run an economy in a sustainable future."
https://phys.org/news/2006-12-hydrogen-economy-doesnt.html#jCp
the Perfect Burger According to Science | The Burger Show
More than you ever wanted to know about making the perfect burger, and the science of what makes it so good. Hungry yet?
The science of food MOFAD
Museum of Food and Drink https://g.co/kgs/54WHDJ
"An interest in food science led Mr. Arnold to create the Department of Culinary Technology at the French Culinary Institute, and he soon began thinking of a museum that would tackle the history and culture of food. New York had a museum of sex. What about the other great primal urge?"
https://www.nytimes.com/2015/10/21/arts/design/museum-of-food-and-drink-takes-a-look-at-flavor.htmlAS BULK FOOD SALES GROW, SO DO HEALTH QUESTIONS - The New York Times
Bargain prices trump hygiene - this is an old article but the arguments still hold true.
Friday, July 27, 2018
Faster Way to Teach a Child How to Ride a Bike (Without Training Wheels)
-remove the pedals, lower the seat, then have them walk, then bunny-hop with their feet, then glide longer bunny-hops, then glide-walking, before putting the pedals back on.
The high cost of free parking
Parking requirements in building codes often require more parking space than indoor space in the building.
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