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London ; New York : Routledge, 2008

Zhu, Yanqiang

Billions of years ago, Mars probably hosted many water features: streams, rivers, gullies, etc. But until recently, water detected on the Red Planet was either locked up in ice or flitting about as a gas in the atmosphere. Now, researchers analyzing radar data from the Mars Express mission have found evidence for an enormous salty lake under the southern polar ice cap of Mars. Daniel Clery joins host Sarah Crespi to discuss how the water was found and how it can still be liquid—despite temperatures and pressures typically inhospitable to water in its liquid form. Read the research. Sarah also talks with science journalist Katherine Kornei about her story on changing athletic performance after gender transition. The feature profiles researcher Joanna Harper on the work she has done to understand the impacts of hormone replacement therapy and testosterone levels in transgender women involved in running and other sports. It turns out within a year of beginning hormone replacement therapy, transgender women plateau at their new performance level and stay in a similar rank with respect to the top performers in the sport. Her work has influenced sports oversight bodies like the International Olympic Committee. In this month’s book segment, Jen Golbeck interviews Andrew Lawler about his book The Secret Token: Myth, Obsession, and the Search for the Lost Colony of Roanoke. Next month’s book will be The Book of Why: The New Science of Cause and Effect by Judea Pearl and Dana Mackenzie. Write us at sciencepodcast@aaas.org or tweet to us @sciencemagazine with your questions for the authors. This week’s episode was edited by Podigy. Download a transcript of this episode (PDF) Listen to previous podcasts. [Image: Henry Howe; Music: Jeffrey Cook]

Barker Library - TE7.N275 no.889

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Principals have almost as much of an impact on student achievement as teachers do. Indeed, we found in a study of school reform in Washington, D.C., that replacing ineffective principals improves student achievement. But how do we distinguish good principals from bad ones?

Statistical highlights of the fourth day's play of the third cricket Test between India and Sri Lanka in New Delhi on Tuesday

In the summer of 2017, the National Quality Forum (NQF) announced the formation of a Scientific Methods Panel (hereafter referred to as “the Panel”) as part of a redesign of its endorsement process.

Mars Orbiter is travelling at a distance of about 2.9 million km away from Earth.

Submit a talk or buy a ticket! Check out JS Remote Conf!

02:30 - Nik Molnar Introduction

• Twitter
• GitHub
• Blog

02:50 - What Microsoft’s Cross-Platform and Open Tooling Team Does

03:41 - Microsoft and Open Source

05:25 - Performance

08:15 - Is good, clean architecture at odds with high-performance code?

09:41 - Latency and Bandwidth

• Moore’s Law

20:23 - Hierarchy of Needs for Users of Software

• Aaron Walter: Emotional Interface Design: The Gateway to Passionate Users
• Maslow’s Hierarchy of Needs

24:36 - Controlling Performance

• “Performance Budget”

26:21 - The Cost of Performance (ROI)

31:57 - Speed Index

• WebPagetest

41:50 - Avoiding the “It feels fast on my machine” Syndrome

45:03 - RUM = Real User Monitoring

• Navigation Timing
• Resource Timing
• User Timing

46:24 - Synthetic Testing

47:50 - Performance Audits

• OODA Loop
  • Observe
  • Orient
  • Decide
  • Act

50:39 - Do Less

More From Nik

• Nik Molnar: Full Stack Web Performance
• Nik Molnar: Tracking Real World Web Performance
• Navigation Timing API
• Resource Timing: W3C Working Draft 20 October 2015

Picks

UtahJS 2015 (Dave)
ES6 Overview in 350 Bullet Points (Jamison)
Saturday Morning Breakfast Cereal (High Frequency Training) (Jamison)
Chris Zacharias: Page Weight Matters (Jamison)
React Rally Talks (Jamison)
MONEY Master the Game: 7 Simple Steps to Financial Freedom by Tony Robbins (Chuck)
Rush Revere and the Star-Spangled Banner by Rush Limbaugh (Chuck)
Visual Studio Code (Nik)
High Performance Browser Networking by Ilya Grigorik (Nik)
Nik's Pluralsight Courses (Nik)

There’s still time! Check out and get your JS Remote Conf tickets!

JavaScript Jabber Episode #184: Web Performance with Nik Molnar (Part 1)

02:04 - Nik Molnar Introduction

• Twitter
• GitHub
• Blog
• Glimpse
• [Pluralsight] WebPageTest Deep Dive

02:58 - RAIL (Response, Animation, Idle, Load)

06:03 - How do you know what is being kicked off? How do you avoid it?

08:15 - Frame Rates

• frames-per-second.appspot.com
• CSS Triggers

16:05 - Scrolling

• requestAnimationFrame

19:09 - The Web Animation API

21:40 - Animation Accessibility, Usability, and Speed

• haveibeenpwned.com
• Ilya Grigorik: Speed, Performance, and Human Perception @ Fluent 2014

27:14 - HTTP and Optimization

• Yesterday's perf best-practices are today's HTTP/2 anti-patterns by Ilya Grigorik
• Ruby Rogues Episode #135: HTTP 2.0 with Ilya Grigorik
• Hypertext Transfer Protocol Version 2 (HTTP/2)
• Can I use...
• Server Push

35:25 - ES6 and Performance

• ES6 Feature Performance
• six-speed

40:46 - Understanding the Scale

• Grace Hopper: Nanoseconds
• Grace Hopper on Letterman

43:30 RAIL (Response, Animation, Idle, Load) Cont’d

46:15 - Navigator.sendBeacon()

47:51 - Memory Management and Garbage Collection

• Memory Management Masterclass with Addy Osmani
• Addy Osmani: JavaScript Memory Management Masterclass
• Under the Hood of .NET Memory Management by Chris Farrell and Nick Harrison (Nik)
• Memory vs Performance Problems
• Rick Hudson: Go GC: Solving the Latency Problem @ GopherCon 2015

Picks

Hardcore History Podcast (Jamison)
Static vs. Dynamic Languages: A Literature Review (Jamison)
TJ Fuller Tumblr (Jamison)
Pickle Cat (Jamison)
WatchMeCode (Aimee)
Don’t jump around while learning in JavaScript (Aimee)
P!nk - Bohemian Rhapsody (Joe)
Rich Hickey: Design, Composition and Performance (Joe)
Undisclosed Podcast (AJ)
History of Gaming Historian - 100K Subscriber Special (AJ)
15 Minute Podcast Listener chat with Charles Wood (Chuck)
JS Remote Conf (Chuck)
All Remote Confs (Chuck)
Clash of Clans (Chuck)
Star Wars Commander (Chuck)
Coin (Chuck)
The Airhook (Chuck)
GoldieBlox (Chuck)

Panel:

• Aimee Knight
• Charles Max Wood
• Christopher Ferdinandi (Boston)

Special Guests: Dan Shappir (Tel Aviv)

In this episode, the panel talks with Dan Shappir who is a computer software developer and performance specialist at Wix.com. As Dan states, his job is to make 100 million websites (hosted on the Wix platform) load and execute faster! Past employment includes working for companies, such as: Ericom, Ericom Software, and BackWeb. He studied at Technion Institute of Management and currently lives in Tel Aviv, Israel. The panel talks about web performance API among other things. Check it out!

Show Topics:

1:29 – Charles: Let us know who you are and why you’re famous!

1:39 – “Hello!” from Dan Shappir.

2:25 – Charles: You should say that you go to EACH site EVERY day out of the millions of sites out there.

2:53 – Charles: My mom mentioned Wix to me at first. My mom teaches High School Math.

3:16 – Dan: Yes that is our mission statement. That everyone can get a website without the knowledge of how to build a website.

3:52 – Aimee makes her comments.

3:59 – Dan: On our platform we try to offer people flexibility. There are bounds and limits, but people can do their very own thing, though. To make Wix faster because as we add more features and functionality that is our goal.

4:40 – Chuck: Okay, I know how to make X perform a little bit better. You are looking at a platform that controls TONS of sites, how do you even go about that?

4:58 – Dan: It is more difficult then that. We have millions of users leveraging the platform but there are a lot of developers in Wix who are developing the platform. I don’t think anyone at Wix has a total grasp of the complexity of the platform that we built. We have hundreds of frontend people working on our platform. All of them have pieces to the kingdom. We have processes in place with code reviews and whatnot, but there is so much going on. There is a change every 2 minutes, 24/7. We need to make sure progressing instead of regressing. 

6:54 – Aimee: I think it was interesting in one of the links you sent over. Because you know when something is getting worse you consider that a bug.

7:15 – Dan: It is more than a bug because if we see regression in performance then that is a problem. I can literally see any part of the organization and say, “stop” if it will

7:57 – Chuck: We are talking about performance, but what does that mean? What measures are there?

8:15: Dan: We are looking at performance can mean different things in different contents. User sites, for example, most important aspect is load time. How quickly the page loads and gets open to the viewer to that specific site. When they click something they want it instantly and no drag time. It does change in different contexts.

9:58 – Chuck: People do talk about load time. People have different definitions of it.

10:12: Dan: Excellent question. When you look at the different sites through Wix. Different people who build sites – load time can mean something else to everybody. It can mean when you see the MAIN text or the MAIN image. If it’s on an ECON site then how soon can they purchase or on a booking site, how long can the person book X product.

I heard someone at a conference say that load time is when: HERO TEXT And HERO IMAGE are displayed.

12:14 – Chuck: What is faster React or Vue?

12:21 – NEW HOST: Not sure. It all depends.

12:34 – Dan: We are big into React. We are one of the big React users outside of Facebook. I joined Wix four years ago, and even back then we were rebuilding our framework using React. One of our main modifications is because we wanted to do server-side rendered.

13:27 – Christopher asks Dan a question.

14:16 – Dan: We are in transition in this regard. Before we were totally client-site rendered, and that was the case until middle of last year. Then we deployed...

Dan: We are 100% server-side rendered now. Some things we are still using JavaScript. We have another project going on now and it’s fully CSS, and little JavaScript as possible. What you might want to do with that site is...

You might get in a few months every Wix site will be visible even if JavaScript is disabled.

16:26 – Aimee adds in her comments and observations to this topic.

16:55 – Dan: We don’t want things displayed incorrectly before it lays out. We hide the content while it’s downloading then make it visible. They lay-outing are done faster, because...

17:44 – Christopher asks Dan a question.

18:04 – Dan: I got into API...

Either you are moving forward or are you moving back. AKA – You are either progressing or regressing.

Different stages:

1.) Development stage

2.) Pre-Production (automated tools that check the performance with specific use cases)

3.) Check it out!

It’s beneficial to use these APIs.

21:11 – Christopher: What is performance APIs?

21:38 – Dan: There is a working group – Todd from Microsoft and others who are exposing the information (that is available in the browser) out into the browser. When the browser downloads a certain source (image, font, etc.) it can measure the various stages of downloading that feature.  You have these different sages of downloading this resource. The browser can measure each of these stages and then expose them to you. Basically it’s for the browser to expose this information to you and in a way that is coherent and uniform. It essentially maintains this buffer that puts performance entries sequentially.

Dan continues explaining this topic in detail.

25:55 – Dan: You have this internal buffer...

28:45 – Advertisement – Sentry – They support opensource.

29:39 – Christopher: everything you are saying seems that I can use this or that tab right now...

Why would I prefer the API to something visual, hypothetically?

30:03 – Dan: Three Different Stages. (See above.)

This information is very, very helpful during the developmental stage. Say you got a link from someone...

Dan mentions: Performance.mark

34:04 – Aimee: When you were talking about resource-ends. Many people don’t know what this is. Can you spend 2-3 minutes about how you guys are using these? Are there people can add for big bang for their buck?

34:41 – Dan: This might want to be a topic for its own podcast show.

Dan gives a definition of what a resource-end means.

Go back to fonts as an example.

Pre-connect for example, too.

39:03 – Dan: Like I said, it’s a huge topic.

You have to exercise some care. Bandwidth is limited. Make sure you aren’t blocking other resources that you do need right now.

40:02 – Aimee: Sounds like a lot of great things to tap into. Another question I have is about bundling.

40:27 – Dan: One of the things that we try to do (given that we are depending on the JavaScript we are downloading) we need to download JavaScript content to the client side. It has been shown often that JS is the most impactful resources that you need to download. You really want to be as smart as possible with that. What is even more challenging is the network protocols are changing.

Dan continues to go in-depth about this topic.

Dan: What we have found is that you want to strive to bundle resources together.

44:10 – Aimee: Makes sense.

44:15 – Dan continues talking about this topic.

45:23 – Chuck asks two questions. (First question is now and second question is at 51:32.)

2 Questions:

1. You gather information from web performance AI - What system is that?

45:42 – Dan: I am not the expert in that. I will try not to give misleading information. Actually let me phrase it different. There are 3^rd party tools that you can use leverage in your website. IF you are building for commercial reasons I highly recommend that you use performance-monitoring solution. I am not going to advertise one because there are tons out there. We ended up rolling out our own infrastructure because our use case is different than most.

At a conference I talked with a vendor and we talked about...

51:32 – 2^nd Question from Charles to Dan: Now you’ve gathered this information now what to you do? What patterns? What do you look for? And how do you decide to optimize things?

54:23 – Chuck: Back to that question, Dan. How should they react to it and what are they looking for

54:41 – Dan: Three main ways: 1.) Generate alerts 2.) See trends over long period of time 3.) Looking at real-time graphs.

Frontend developer pro is that likely being woken up in the middle of the night is lower. We might be looking at the real time graph after we deployed...

57:31 – Advertisement – Get a Coder Job!

58:10 – Picks!

Links:

• JavaScript
• jQuery
• React
• Elixir
• Elm
• Vue
• Wix
• Window Performance
• Web Performance
• Terra Genesis
• Terra Genesis: Space Colony
• The One Thing
• DevChat TV – YouTube
• GitHub: Off Side
• HBO: Insecure
• Wix: Engineering
• JavaScript Riddle
• JavaScript Riddles for Fun and for Profit
• Dan Shappir’s Twitter
• Dan Shappir’s LinkedIn
• Dan Shappir’s Crunch Base
• Dan Shappir’s GitHub
• Dan Shappir’s Talk through Fluent
• Dan Shappir’s Medium
• Dan Shappir’s YouTube Talk: JavaScript riddles for fun and profit

Sponsors:

• Code Badges
• Kendo UI
• Sentry
• Digital Ocean
• Cache Fly
•  

Picks:

Aimee:

• Waking up early!
• How to Deal with Dirty Side Effects in Your Pure Functional JavaScript

Chris:

• Offside - Toomuchdesign
• Insecure TV Show

Charles:

• Terraform - Game
• “The One Thing"
• Code Badge
• DevChat on YouTube

Dan

• Wix Engineering
• JavaScript Riddle

JavaScript Remote Conf 2020

May 14th to 15th - register now!

Dan Shappir takes the lead to explain all of the acronyms and metrics for measuring the performance of your web applications. He leads a discussion through the ins and outs of monitoring performance and then how to improve and check up on how your website is doing.

Panel

• AJ O’Neal
• Aimee Knight
• Steve Edwards
• Dan Shappir

Sponsors

• Taiko, free and open source browser test automation
• Educative.io | Click here for 10% discount

____________________________________________________________

"The MaxCoders Guide to Finding Your Dream Developer Job" by Charles Max Wood is now available on Amazon. Get Your Copy Today!

____________________________________________________________

Links

• <picture>: The Picture element - HTML: Hypertext Markup Language | MDN

Picks

AJ O’Neal:

• The Way of Kings
• Taco Bell

Aimee Knight:

• web.dev
• @DanShappir

Dan Shappir:

• New accessibility feature in Chrome Dev Tools: simulate vision deficiencies, including blurred vision & various types of color blindness. In Canary at the bottom of the Rendering tab.
• Better Call Saul

Follow JavaScript Jabber on Twitter > @JSJabber

Moon, Krystyn R., 1974-

Young, Vershawn Ashanti

Alegre, Helena, author

Online Resource

Read, Nicholas A. C

Kaynak, Hale, 1956-

Hawk, Ryan, author

Kirkman, Bradley Lane, author

Interview with Rebecca N. Dudovitz, MD, MSHS, author of Assessment of Exposure to High-Performing Schools and Risk of Adolescent Substance Use: A Natural Experiment

Interview with Justin S. Golub, MD, MS, author of Association of Subclinical Hearing Loss With Cognitive Performance