Saturday, July 25, 2020
Sunday, July 19, 2020
Friday, July 17, 2020
puzzle
I had to explain this one to a ton of people on Facebook. I got it on the first try. The guy who posted said that it took him 6 or 7 tries.
What I don't like about these problems is that they change the pictures in the last line, requiring us to infer the values and confusing the solver. It is not just a matter of simple algebra.
What I don't like about these problems is that they change the pictures in the last line, requiring us to infer the values and confusing the solver. It is not just a matter of simple algebra.
Thursday, July 9, 2020
Wednesday, July 1, 2020
Tuesday, June 30, 2020
The US electrical system is not 120V
Most people might not be interested in this, but this relates to electric cars.
Thursday, June 25, 2020
Man Tracks Down People He Photographed in the Street 40 Years Ago to Recreate Their Pictures
These are interesting. Forty years ago I was taking my first college class during the summer.
Wednesday, June 24, 2020
GE 450-Watt EQ Warm White LED Light Bulb at Lowes.com
https://www.lowes.com/pd/GE-450-Watt-EQ-Warm-White-LED-Light-Bulb/1002741378
First of all, who needs a 450-watt equivalent light bulb? What would you use it for? Second, why does it cost $265?
Saturday, June 20, 2020
Friday, June 19, 2020
Sunday, May 17, 2020
Thursday, April 9, 2020
Sunday, March 22, 2020
Tuesday, January 21, 2020
Monday, January 13, 2020
Can This Deadly New Virus Destroy the Human Race?
Many of the recent scary diseases have come from China, which makes sense given the large population base and population density. More than half the world's population lives within a circle in Southern Asia including China and India.
https://youtu.be/-Jhz0pVSKtI
https://youtu.be/-Jhz0pVSKtI
Friday, January 3, 2020
Wednesday, January 1, 2020
Monday, December 23, 2019
Sunday, December 22, 2019
Sunday, December 15, 2019
Ringworld - Wikipedia
https://en.wikipedia.org/wiki/Ringworld
Just finished the audiobook for this on YouTube. Great book. https://youtu.be/4DMkDqIjEuI
I read the novel around 30 years ago. The YouTube version of this is a little uneven on quality. I suspect that it was copied from audio tape.
I already have listened to the next two books on Audible. I may listen to them again. I started with the 4 prequels on Audible and I'm slowly working my way through the entire series.
Best wishes,
John Coffey
Wednesday, December 11, 2019
Sunday, December 1, 2019
Thursday, November 28, 2019
You can launch a balloon mission to the stratosphere for about the cost of an iPad. | Space
https://www.space.com/20089-near-space-balloons-science.html
I have been wondering for a long time why couldn't you have a space capsule that is lifted by multiple hydrogen-filled balloons, and when it reaches the maximum altitude, it would pump the hydrogen out of the ballons and use it for fuel to continue its journey upwards? At the maximum balloon height, air resistance would be minimal. The temperatures would be cold making it easier to store gasses under compression if you need to.
I assume that ordinary balloons will break or be fragile. Perhaps tougher materials can be devised for this.
You will also need oxygen. The only question is if you can get enough from the atmosphere when you need it, or if you have to store it. I'm thinking that maybe you could work out a process to acquire and store it as you rise.
To get a better technology, we need a really dense energy source, such as nuclear power, nuclear fusion, or antimatter. The last two are beyond our capability, for now.
Saturday, November 23, 2019
Thursday, October 24, 2019
Mad Queen Chess
Between the years 1475 and 1500, a new variant of chess arose called "Mad Queen Chess." The previously weak queen suddenly became the most powerful piece on the board. This made games more exciting and allowed them to finish faster. This is the version of chess we play today, with only minor differences.
I thought that "Mad Queen Chess" originated in England during the reign of Queen Mary I during the 1500s, but it actually originated in Spain in the late 1400s because Queen Isabella was a very powerful Queen.
I think that chess is being played now more than ever, but it has shifted to online. When I first got on the board of the Utah Chess Association around the year 2000, the membership was down to 500's, compared to the heyday of around 800 to 900. By the time I left Utah, it was 350. Some of this decline happened while I was President of the Utah Chess Association. If it wasn't for the kid's tournaments it would have less than 100.
Best wishes,
John Coffey
--
Best wishes,
John Coffey
http://www.entertainmentjourney.com
I thought that "Mad Queen Chess" originated in England during the reign of Queen Mary I during the 1500s, but it actually originated in Spain in the late 1400s because Queen Isabella was a very powerful Queen.
I think that chess is being played now more than ever, but it has shifted to online. When I first got on the board of the Utah Chess Association around the year 2000, the membership was down to 500's, compared to the heyday of around 800 to 900. By the time I left Utah, it was 350. Some of this decline happened while I was President of the Utah Chess Association. If it wasn't for the kid's tournaments it would have less than 100.
Best wishes,
John Coffey
--
Best wishes,
John Coffey
http://www.entertainmentjourney.com
Sunday, October 20, 2019
Friday, October 18, 2019
Tuesday, September 17, 2019
M&M's - Wikipedia
The candy-coated chocolate concept was inspired by a method used to allow soldiers to carry chocolate in warm climates without it melting.
During World War II, the candies were exclusively sold to the military
https://en.wikipedia.org/wiki/M%26M%27s
During World War II, the candies were exclusively sold to the military
https://en.wikipedia.org/wiki/M%26M%27s
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