"Dirt is probably the cheapest and simplest construction material out there, but it's not very strong compared to other choices. Luckily geotechnical engineers have developed a way to strengthen earthen materials with almost no additional effort - Mechanically Stabilized Earth (aka MSE or Reinforced Soil). If you look closely, you'll see MSE walls are everywhere. Thanks for watching, and let me know what you think!"
I think it’s very strange that Microsoft Windows doesn’t have a root directory where all volumes are mounted, or that it doesn’t use forward slashes. Anything not POSIX-compatible seems very idiosyncratic as we head into second decade of 20th century.
In this video we look at chiller types and refrigerant compressor cooling technology within HVAC commercial refrigeration and provide an overview guide on when and where each chiller type is used. This covers air cooled chillers and water cooled chillers, centrifugal compressors, turbocor compressors, screw compressors, scroll compressors, reciprocating compressors, absorption chillers. We look at both vapor compression and vapor absorption chillers. How chillers work and the basic working principle of each.
What nobody knew at the time was that the ThinkPad name, design aesthetic, and emphasis on technological innovation in the service of reliable productivity would have such staying power. Any citizen of late 1992 who encountered a modern ThinkPad such as the X1 Carbon would likely be blown away by the machine’s thin-and-light form factor–less than a third the thickness and weight of the 700C–and high-resolution screen, and would certainly be confused by it carrying a Lenovo nameplate rather than that of IBM. (The Chinese manufacturer acquired IBM’s PC business in 2005.) But if that person was familiar with the ThinkPad 700C, identifying the X1 Carbon as a ThinkPad would be easy. You can’t say anything similar about a 1992 Apple PowerBook and a 2017 MacBook.
I had a Thinkpad for a number of years. It was a good laptop until the case started to fall apart. I liked how standardized the machines were and easy/inexpensive to get parts, and how you could customize them to your hearts delight. Great machines for running Linux on for sure!
Encryption backdoors - breaking WhatsApp and iMessage's security to let the government stop Bad Things - sounds like a reasonable idea. Here's why it isn't.
I often wondered who and what made it possible for my alcoholic buddy to wield such a dangerous tool. They’ve been around in one form or another for a while, of course — the invention of lasers writ large can be traced all the way back to 1900, which was when famed German physicist Max Planck published a paper surmising that energy is made of individual units, which he called quanta. His theory would later inspire Albert Einstein, who became the first person to realize that light is made up of photons in 1905. Using this knowledge, Einstein proposed a theory called stimulated emission, a process by which electrons (previously known as the aforementioned quanta) can be stimulated to emanate light of a particular wavelength. This is the process that would eventually make lasers possible.
Forty years later, Columbia University professor Charles Townes conceptualized a device that would come to be known as a maser (microwave amplification by stimulated emission of radiation) while sitting on a park bench in Washington. Based on Einstein’s stimulated emission theory, the device was able to amplify and even generate electromagnetic waves. A few years later, in 1957, Columbia University graduate student Gordon Gould scribbled the acronym LASER (light amplification by stimulated emission of radiation) and described the elements needed for constructing one in his notebook, which would eventually become the focus of a 30-year court battle for the patent rights to the device.
