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Sean Leather
Lives in Pretoria, South Africa
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Sean Leather

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On the evidence for Ockham’s Razor
Ockham’s Razor says that simplicity is a scientific virtue, but justifying this philosophically is strangely elusive
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Sean Leather

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Toilet etiquette is where prudery meets absurdity.
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Sean Leather

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Dr. Cheng recognizes that people can feel uncomfortable with some of the abstractions required by mathematical thinking, by the need to ignore the particulars of, say, this green round pillow and that square purple pillow in favor of an abstract ideal of a pillow that you’re going to call x.

But it’s just a matter of practice, she said, before the idea starts to feel like a real object that you can manipulate with ease. “You become very good at separating what’s relevant from what isn’t, and that can be very useful in daily life,” she said.
It can also be a piece of pie, or custard — so says a professor and author who spreads the magic of numbers through dessert recipes.
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Sean Leather

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cabal new-build: full of yummy new-ness!
cabal new-build, also known as “Nix-style local builds”, is a new command inspired by Nix that comes with cabal-install 1.24. Nix-style local builds combine the best of non-sandboxed and sandboxed Cabal: Like sandboxed Cabal today, we build sets of independent local packages deterministically ...
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Can you please help on this 
Write a function alt :: [a] -> [a] that takes a list as argument and returns a list that contains the first, third, fifth etc element of that list. That is return every second item of the list, starting with the fisrt element.
For example:
alt "abc" ⇒ "ac"
alt "abcd" ⇒ "ac"
alt [1..8] ⇒ [1,3,5,7]
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Sean Leather

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It is stunning to watch a single judge instantly shut down a key means of online communication. But similar battles are inevitable.
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Yep.
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My pessimism: It will probably take another crisis to do the things mentioned in this article, but, even then, I doubt it will be done.
A downturn is inevitable, and America isn’t ready — yet.
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Have them in circles
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Sean Leather

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I could use many of these symbols
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From their observations, the scientists determined that all three planets are likely tidally locked, with permanent day and night sides. The two planets closest to the star may have day sides that are too hot, and night sides too cold, to host any life forms. However, there may be a “sweet spot” on the western side of both planets — a region that still receives daylight, but with relatively cool temperatures — that may be temperate enough to sustain conditions suitable for life. The third planet, furthest from its star, may be entirely within the habitable zone.

I wonder how common star-planet tidal lock is. I would imagine that it reduces the probability of life developing and flourishing on a planet by limiting the habitable areas.
Just 40 light years from Earth, planets are best targets so far for search for extraterrestrial life.
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Having lived outside the US for a number of years, I didn't know about this transition away from mobile contracts. Seems to be positive.
Know What You Are Paying For For years, cell phone users have been weighed down by the ball and chain of the dreaded two-year contract ...
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Yeah Canada sucks :) I think some reasons are: low population density, under-investment by a small cartel of suppliers, over-regulation, a tendency of big companies to buy cheaper startups, and complacency of consumers who don't know how cheap it could be. There are also effects around neighbourhoods and buildings having only one provider option sometimes, or only one major provider. For TV, which is also pricey for limited cable packages, companies sweet talk condo boards into multi-year deals.

Sean Leather

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Jon Stokes has an enlightening series of articles on smart guns as a non-solution to the problem of gun violence.

Why Obama’s Smart Gun Push Will Misfire
http://techcrunch.com/2016/01/05/why-obamas-smart-gun-push-will-misfire/

Why the NRA hates smart guns
http://techcrunch.com/2016/04/30/why-the-nra-hates-smart-guns/
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Sean Leather

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Simon's main research interest is in functional programming languages, their implementation, and their application. He was a key contributor to the design of the now-standard functional language Haskell, and is the lead designer of the widely-used Glasgow Haskell Compiler (GHC).
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More than deserved! Congratulations to +Simon Peyton Jones!
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Places
Map of the places this user has livedMap of the places this user has livedMap of the places this user has lived
Currently
Pretoria, South Africa
Previously
Utrecht, Netherlands - Austin, TX, USA - St. Louis, MO, USA - Chattanooga, TN, USA
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Introduction
I'm a PhD student in Computer Science at Utrecht University in the Netherlands. I've been in school for most of my life. One of these days, I'll figure out what I'm going to do once I get out.
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Sean Leather's +1's are the things they like, agree with, or want to recommend.
3quarksdaily: Transgender bathrooms, evolution, climate change, and the ...
www.3quarksdaily.com

by Paul Braterman Toilet signs on sale at ebay Toilet etiquette is where prudery meets absurdity. Your chance of being embarrassed, let alon

winterkoninkje. Quantifiers in type theory
winterkoninkje.dreamwidth.org

All this stuff is "well known", but I want to put it out there for folks who may not have encountered it, or not encountered it all together

Announcing cabal new-build: Nix-style local builds : Inside 736-131
blog.ezyang.com

cabal new-build, also known as “Nix-style local builds”, is a new command inspired by Nix that comes with cabal-install 1.24. Nix-style loca

New World of Cell Phone Contracts
www.huffingtonpost.com

Know What You Are Paying For For years, cell phone users have been weighed down by the ball and chain of the dreaded two-year contract ...

World Leaders to Sign Climate Agreement on Earth Day
learningenglish.voanews.com

Leaders from 130 nations are gathering in New York to sign the historic climate deal. They will sign the Paris climate agreement at the Unit

While everyone was focused on Zika, yellow fever quietly became a global...
www.vox.com

The outbreak is a reminder of how we continually fail to plan for deadly epidemics.

SA’s public protectors - the legacies, part one | Corruption Watch
www.corruptionwatch.org.za

Our first three-part Bua Mzansi series looks at the careers of South Africa's three public protectors to date. Part one starts with Selby Ba

Cheap Docker images with Nix
lethalman.blogspot.com

Let's talk about Docker and Nix today. Before explaining what Nix is, if you don't know yet, and before going into the details, I will show

A compendium of Nkandla reports & court papers - Africa Check
africacheck.org

Following the Nkandla judgment by the South African constitutional court, we present a guide to key events in the debacle as told through va

Why North Carolina’s New Anti-LGBT Law is a Trojan Horse
www.propublica.org

It’s not just bathrooms. Lawmakers also took away the right to sue under state law for all kinds of employment discrimination.

GUIDE: 7 steps to detect if someone is talking science nonsense - Africa...
africacheck.org

Scientific research is conducted by experts, but they may have agendas of their own. How can journalists and the public tell whether they're

trofi's blog: GHC on m68k
trofi.github.io

GHC on m68k. This all started from this ghc bug report. The bug stated that on m68k ABI return values of int-type are passed in register %d0

South Africa's anti-corruption campaigners deploy satire - BBC News
www.bbc.com

South African activists are using satire to fight back after a wave of high-profile corruption scandals in the country.

UTF-8 Everywhere
utf8everywhere.org

Microsoft has often mistakenly used 'Unicode' and 'widechar' as synonyms for both 'UCS-2' and 'UTF-16'. Furthermore, since UTF-8 cannot be s

No, arthritic goat milk cannot cure HIV - Africa Check
africacheck.org

An Australian doctor claimed that his treatment of milk from goats with arthritis can cure HIV. But he's taken a nugget of science and twist

Was HIV only SA's 9th leading cause of death in 2006? Why Mbeki’s claim ...
africacheck.org

Problems with the way HIV-related deaths are captured on official death certificates vastly underestimate the true death toll of the virus.

Public - 4 months ago
reviewed 4 months ago
Well-kept, finely decorated environment with a convenient location for visiting Gold Reef City and other areas of southern Johannesburg. We are a couple who stayed one night over a weekend in July to go to the Gold Reef City Casino to see a show. The facilities were mostly comfortable. Our main complaint was that our deluxe double room was cold. The large bedroom was heated by one wall panel heater, which is not sufficient in the middle of the South African winter. Naturally, the bathroom floor and shower walls, being tile, were also cold, but this is not unusual for these kinds of houses. The owners were pleasant and helpful. I enjoyed talking to Eddie about cricket and to his friendly bird who visited my shoulder. The breakfast food was simple but fine. We do think the logistics of breakfast could be done better. There was some confusion about where to find items for drinking tea and eating cereal. Other parties had problems with their orders. Perhaps it would be better to arrange not just the time of breakfast but also the order the day before the meal. Overall, the experience was not too unpleasant. We might consider returning to Villa Lugano in the summertime.
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Public - a year ago
reviewed a year ago
A great place to learn about snakes and other creepy crawlies. James, our tour guide, was very knowledgeable and made it a fun and enjoyable experience. He even convinced my wife (who doesn't like snakes) to hold a Burmese python!
Public - 2 years ago
reviewed 2 years ago
Great burger and grilled tiger prawns. Superb view from every table.
Public - 2 years ago
reviewed 2 years ago
37 reviews
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The Rhino and Lion Nature Reserve is a nice place to go for a day trip to see some animals. It's kind of like a big zoo without all of the cages except for the big predators, who have large separate fenced areas for each group (brown lions, wild dogs, white lions, and cheetahs). However, the reserve is not so big that you won't see everything in a day. Unlike the Kruger National Park, you don't have to drive around for hours wondering if you'll see lions. On the other hand, the reserve is not as wild as the park, and much of that mystique is missing. Be sure to plan your trip in advance. Look up the lion feeding time and other events. These are important for getting the most out of your trip. If you have a utility vehicle or 4x4, definitely bring it. None of the roads are paved, and in some areas, e.g. the cheetahs, you will really struggle in a 2-door hatchback like we had. Overall, we enjoyed it. The staff was helpful. The food at the Boma Restaurant was pretty good. If you're staying in the Johannesburg/Pretoria area and want to see some wild animals, you should check out the Rhino and Lion Nature Reserve.
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Public - a year ago
reviewed a year ago
Fabulous! My fiancée (now wife) booked the honeymoon package at Elephant Hide in Knysna. First of all, let's put aside the fact that Knysna is gorgeous and completely worth your while. There's plenty to see and do. It's one of the rare places that I actually want to visit again. Let me just say that Elephant Hide is unbelievably fantastic. The people (Ryan, Mandy, Fish, and Eliot) are all very nice, helpful, and accommodating. The room was extremely comfortable. The view of the lagoon from our bedroom, bathroom, AND shower room was outstanding. The breakfast was delicious. And the location is very convenient while also being very quiet. Oh, and I'm told that the package price was pretty good, too. I would definitely recommend Elephant Hide to anyone. I'd also stay there again, myself.
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Public - 2 years ago
reviewed 2 years ago