Alex Wilhelm from TechCrunch discusses today's stock market plunge, Android lock patterns are not secure, the President of the United States was probably not an Ashley Madison client, a wearable for your eyeball, how "not" to create a fun Tech work environment, and more...

Host: Megan Morrone

Guest: Alex Wilhelm

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Unboxing the Samsung Galaxy Note 5 and the OnePlus Two, reviews of the Samsung Galaxy Grand Prime smartphone, Grain Audio OEHP: Over Ear Headphones With Solid Wood Cups, and the Journo Bluetooth Keyboard.

Host: Fr. Robert Ballecer, SJ

Guests: Leo Laporte, Myriam Joire, and Mike Elgan

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Flash is dead in the Enterprise, Test before deploying Software Updates, iOS losing its Enterprise Edge, and interview with Christopher Mitchell Director of Community Broadband Networks.

Hosts: Fr. Robert Ballecer, SJ, Brian Chee, and Curtis Franklin

Guest: Christopher Mitchell

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Privacy expectations and the Ashley Madison hack, design patents and Apple's rounded corners, Instagraming your meal could violate the chef's copyright and more!

Host: Sarah Hinchliff Pearson

Guests: Laura Hamady, Rolf Claessen, and Kat Walsh

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Spotify CEO admits fault in communicating what the privacy policies meant, Ashley Madison hackers just dropped a lot more data, Mercedes might do a joint venture with Apple or Google to build a new car, a live-action first-person shooter Zombie-fest that stunned Chatroulette, and more...

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Hosts: Mike Elgan and Christina Warren

Guests: Greg Sterling, Lily Hay Newman, and Eric Limer

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Scott talks with Dr. Mathias Johansson, CEO of Dirac Research, about improving the sound of an audio system with room correction and other techniques.

Host: Scott Wilkinson

Guest: Mathias Johansson

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Mike Murphy from Quartz explains the neuromorphic chip from IBM, attack of the drones, beware of what you share online, double the trouble, double the security, El Nino is coming are you prepared, and more...

Host: Megan Morrone

Guest: Mike Murphy

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How an AC works and how to build your own simple version for staying cool this summer, Beer lifting quad copter, and the TrackingPoint gun hack from BlackHat.

Let's talk about Air Conditioning

To talk about AC, we first need to make clear what "hot" and "cold" really are.

• "Hot" is really just energy in the process of being transferred from one body to another -- From the body that has more energy, to the one that has less
• In any given system, this transfer of energy will take place until you reach maximum entropy: the energy is as evenly distributed among all the bodies in a system as is possible.
• Also, in any given system, the energy in that system will stay constant (unless that energy is somehow moved away from that system)

So... if we have air blowing in our face, and it feel "hot", it just means that the molecules in that air contain more energy than the molecules in our face, and energy is being transferred from the air to our faces.

Conversely, if that air feels "cold" it means that the molecules in that air contain less energy that the molecules in our face, and energy is being transferred from our faces into the air.

Now that we have that sorted, let's talk about HOW we make that blowing air hot or cold.

To make air feel hot, we simply add energy to it:

• A furnace burns gas or uses electricity to heat up coils
• Air is blown over the element being heated by the gas or electricity
• That air "absorbs" heat from the element
• TA DA! (Hot Air)

But to make cold air, the process isn't so simple:

• We can't just add energy into air to make it cold. We need a way to take energy away.
• And remember... the energy in a given system will stay constant unless that energy is somehow moved away from that system
• The answer is to build a system that will absorb heat from one system, and release it into another.
• And THAT is what an air conditioner is designed to do!

Let's talk about a simple 2-stage AC: It has 4 parts

1. Compressor
2. Condensor Coil
3. Expansion Valve
4. Evaporator Coil

1. Compressor
   • The Compressor takes a gas within the system and pressurizes it.
   • Important to note: If you have a gas that has energy level "x" at its regular volume, and you pressurize it to 3x it original pressure in the same volume, then that volume MUST contain 3x the amount of energy. (Again, in a closed system)
   • So... if I have 1 cubic meter of gas at 50 degrees, and I pressurize it to 3x it original pressure, then that volume of gas (at 3x pressure) should be 150 degrees.
   • Super Side Note: This is the "Ideal Gas Law"
     • ((P1*V1)/T1) = ((P2*V2)/T2)
     • (Initial Pressure * Initial Volume)/Initial Temperature = (Final Pressure * Final Volume)/Final Temperature
   • Ok... so now we have a bunch of HOT pressurized gas, but we want COLD gas.
2. Condensor Coil
   • The condensor coil takes the now pressurized gas and gives it contact (through a conductive surface that allows the closed system to retain the gas, while conducting the energy of that closed system) with an outside system.
   • We know that energy (heat) will want to flow from a body of high energy, to a body of lower energy
   • If the system in which that condensor coil is of a lower energy state than the system contained within the coil, then energy (heat) will flow out of the gas, and into that outside system.
   • Given enough time, the
   • Just for

Bui

These show notes have been truncated due to length. For the full show notes, visit https://twit.tv/shows/know-how/episodes/157

Hosts: Fr. Robert Ballecer, SJ and Bryan Burnett

Technical Director: Alex Gumpel

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So much IDF! Skylake dets, the XPoint Optane tech, DX12 benchmarks, Nvidia's GTX 950 is the new 750Ti, 6TB hard drives, and a beginners guide to LN2 cooling.

Hosts: Patrick Norton and Ryan Shrout

Technical Director: Burke McQuinn

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The next drone to own is a submarine, Google's Project Ara modular smartphone is delayed, Silicon Valley fights back against Donald Trump attacks, and more...

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Host: Mike Elgan

Guest: Ryan Whitwam

Producer: Jason C. Cleanthes

Technical Director: Jason C. Cleanthes

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10ghz contesting with Gordon West, Don returns from Huntsville Hamfest, Kit-Building with CQ Magazine's Joe Eisenberg, and more!

Hosts: Don Wilbanks, Gordon West, George Thomas, and Amanda Alden

Guest: Joe Eisenberg

Technical Director: Bryan Burnett

Editor: Victor Bognot

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Hands-on reviews of Quizlet, My Study Life, PhotoMath, and Fallout Shelter.

Host: Jason Howell

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Jason Cross from Greenbot breaks down the Google router, can Google protect our privacy, Ashley Madison user's info revealed, a sneak peak at a fancy new watch from Samsung, a leashed drone, and more...

Host: Megan Morrone

Guest: Jason Cross

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Google wants to cure disease, thoughts on Alphabet, how Google/Larry Page decides to do cool things, and the new hardware of the OnHub.

Hosts: Leo Laporte and Jeff Jarvis

Guest: Matt Cutts

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Update to iOS 8.4.1 to fix Apple Music bugs, turn off location tagging on Instagram for your security, get LastPass for free on your mobile device, and send singing text messages with Ditty!

Host: Megan Morrone

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Microsoft releases its first Windows 10 PC preview build, Desktop Optimization Pack tools released with Windows 10 support, Xbox App for Windows 10 Updated with 1080p/60fps Game Streaming, and more.

Hosts: Paul Thurrott, Mary Jo Foley, and Leo Laporte

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NTP does the job of keeping the clocks right on tens of millions of computers and other networked devices.

Harlan has been working with Unix since the late 70s, and with open source starting probably in the early 80s. He put a lot of effort in to making sure the software he wrote and used was portable... At that time, to install NTP you got a tarball from UDel, unpacked it, read a bunch of instructions, edited the Makefile and a Config file, then built and installed the software...By the summer of 1996 the state of autoconf's testing was "good enough" that I asked Dave Mills if he'd like to see the NTP codebase converted to GNU Autoconf. He agreed, and I started working...Eventually something came up where I said "Dave, please do X because that requires root access." His response was "Here's the root password."...I kinda got "bitten by the bug" and swept up in the process. -- HarlanStenn - 17 Aug 2015

Hosts: Randal Schwartz and Dan Lynch

Guest: Harlan Stenn

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Ashley Madison hackers post the stolen data, the latest TV talent show is for makers, a new electric roadster that sounds like a spaceship, and more...

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Host: Mike Elgan

Co-Host: Kevin Tofel

Guests: Greg Toppo, Molly McHugh, and Deepa Seetharaman

Producer: Jason C. Cleanthes

Technical Director: Jason C. Cleanthes

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This week, we'll be discussing the official name of the next version of Android, Samsung's new fleet of elite devices, a discussion around developing and designing apps as a team, Google's creative lab, and much more!

We invite you to check out the full show notes for today's episode here.

Hosts: Jason Howell, Ron Richards, and Bryan Burnett

Guests: Francisco Franco and Liam Spradlin

Technical Director: Bryan Burnett

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Senior Writer for CNET Joan Solsman joins us to talk about Apple TV, one hub to rule over them all, Makers go mainstream, talk like a physicist, support the US Robots, and more...

Host: Megan Morrone

Guest: Joan Solsman

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