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Chung Wu
Works at Infer Inc
Attended University Of California Berkeley
Lives in Mountain View, CA
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Chung Wu

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I expected that mothers would be less likely than other people to buy into this paranoid view that any child, of any age, left alone for any length of time is going to drop dead the minute the mother looks away. I guess I figured that I'm a mother, and I'm not hysterical about this, so I assumed that other mothers weren't either. But I was wrong — mothers rated all the situations as more dangerous than fathers did; followed by childless women and finally childless men. The people with presumably the most child care experience (mothers) actually expressed the most exaggerated overestimates of risk. I was genuinely surprised by that. But I guess that's because I was expecting people to be rational, and people are just not rational about this subject.
Tania Lombrozo looks at research published Monday showing people's factual judgment of how much danger a child is in while a parent is away varies according to the extent of their moral outrage.
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Very good read, here in Switzerland kids are in no danger and 4 year olds walk to kindergarten alone as the norm.
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V8 and other modern JavaScript engines get their speed via just-in-time (JIT) compilation of script to native machine code immediately prior to execution. Code is initially compiled by a baseline compiler, which can generate ...
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Related Posts: No more leaks with sanitize flags in gcc and clang Do you realize that you are using random hashing? Getting good performance in Go by rewriting parts in C? 100
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How did the comic author get pictures of my family? This is exactly what happens.

http://www.lunarbaboon.com/comics/nice.html
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Keep your connection speed high and your data bill low with Wi-Fi Assistant, a feature that allows you to automatically and securely connect to more than a million, free open Wi-Fi hotspots. Originally a Project Fi exclusive feature, we are now expanding Wi-Fi Assistant to all Nexus users in the United States, Canada, Mexico, UK and Nordic countries. This will roll out to users over the next few weeks. Learn more: http://goo.gl/8I4wcA
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A church facing setbacks elsewhere finds an unlikely foothold.
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Good explainer linked to a great explainer, but really what you need to do is play with this applet showing the actual curve here: https://www.geogebra.org/m/EdSp6X76
 
Sugihara's illusion explained

Wow!  These plastic cylinders look round - but in the mirror they look diamond-shaped.  If you turn them around, they look diamond-shaped - but in the mirror they look round!

This video was made by Kokichi Sugihara, an engineer at Meiji University in Tokyo.  How did he do it???

To answer this question, we should "science the hell out of it", as Matt Damon said in The Martian.   Figure out how objects change appearance when you look at them in a mirror... and design an object that does this!

So +David Richeson scienced the hell out of it:

https://divisbyzero.com/2016/07/05/sugiharas-circlesquare-optical-illusion/

The basic idea is this.  The top rim of this object is not flat.  More precisely, it's not horizontal: it curves up and down!  This affects how it looks.  If you're looking down on this object, you can make part of the top look farther away  by having it be lower

But a mirror reflects front and back.   So in the mirror, part of the top looks closer  if it's lower.

By cleverly taking advantage of this, we can make this object look round, but diamond-shaped in the mirror. 

And if we turn it around, this effect is reversed!

Here's a bit more of the math.  +David Richeson gives the details, so I'll try to present just the basic idea. 

Suppose you're making a video.  Suppose you're looking down at an angle of 45 degrees, just as in this video.   Suppose you're videotaping an object that's fairly far away.

Think about one pixel of the object's image on your camera's viewscreen.

Its height on your viewscreen depends on two things.  It depends on how far up  that piece of the object actually is.  But it also depends on how far back  that piece of the object is: how far away it is from your camera.   Things farther away give higher pixels on your viewscreen.

There's a simple formula for how this works:

pixel height = actual object height + actual distance back

(It's only this simple when you're looking down at an angle of 45 degrees and the thing you're videotaping is fairly far away.)

But what if we're looking in a mirror?  You may think a mirror reverses left and right, but that's wrong: it reverses front and back.  So we basically get
 
mirror image pixel height = actual object height - actual distance back

So, you just need to craft an object for which

actual object height + actual distance back

and

actual object height - actual distance back

give two different curves: one round and one a diamond!

But now for some puzzles:

Puzzle 1.  All that sounds fine: by cleverly adjusting the top rim of the object we can make it look different in a mirror.  But look at the bottom of the object!   What's going on there?  How do you explain that?

Puzzle 2.  Sometimes I know the answers to the puzzles I'm posing.  Sometimes I don't.   Do I know the answer to Puzzle 1, or not?

Puzzle 3.  Same question for Puzzle 2.

Finally, I should admit that I simplified the formula for the mirror image pixel height.  Actually we have

mirror image distance back = constant - actual distance back

and thus

mirror image pixel height =
actual object height + mirror image distance back =
actual object height + constant - actual distance back

In other words, I ignored a constant.  This constant is why the whole mirror image looks higher on your viewscreen than the original object!
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Ugh
 
Apparently cities do not own outright the utility poles in them. I did not know that.

And it's perhaps not surprising that the consortiums that do own them, which often have companies like Comcast and Time-Warner, don't particularly feel like letting Google become a member.

Meanwhile, I just read another story noting that bringing Google Fiber to a neighborhood typically increases property values by 11 percent.

http://www.siliconbeat.com/2016/06/22/google-fiber-raise-rents-11-percent-study-suggests/
Google is running into trouble with competitors trying to block the company's access to utility poles to hang cable for its ultra-fast Internet service. The issue will likely have a profound effect on which Bay Area cities get Google Fiber first.
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  • Infer Inc
    Co-Founder, 2010 - present
  • Google
    Software Engineer, 2005 - 2010
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Mountain View, CA
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Berkeley, CA - Walnut, CA - Arcadia, CA - Taipei, Taiwan
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  • University Of California Berkeley
    Electrical Engineering and Computer Science, 2001 - 2005
  • Walnut High School
    1997 - 2001
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