## January 1, 2018

### How To Avoid Memorizing Times Tables

I was recently told that my niece was trying to memorize her times tables. As an applied mathematician whose coding involves plenty of multiplication, I was not happy to hear this. Nobody who does math actually memorizes times tables, and furthermore, forcing a child to memorize anything is probably the worst possible thing you can do in modern society. No one should memorize their times tables, they should learn how to calculate them. Forcing children to memorize useless equations for no reason is a great way to either ensure they hate math, teach them they should blindly memorize and believe anything adults tell them, or both. So for any parents who wish to teach their children how to be critical thinkers and give them an advantage on their next math test, I am going to describe how to derive the entire times tables with only 12 rules.
1. Anything multiplied by 1 is itself. Note that I said anything, that includes fractions, pies, cars, the moon, or anything else you can think of. Multiplying it by 1 just gives you back the same result.
2. Any number multiplied by 10 has a zero added on the end. 1 becomes 10, 2 becomes 20, 72 becomes 720, 9999 becomes 99990, etc.
3. Any single digit multiplied by 11 simply adds itself on the end instead of 0. 1 becomes 11, 2 becomes 22, 5 becomes 55, etc. This is because you never need to multiply something by eleven. Instead, multiply it by 10 (add a zero to it) then add itself. $11*11 = 11*(10 + 1) = 11*10 + 11 = 110 + 11 = 121\\ 12*11 = 12*(10 + 1) = 12*10 + 12 = 120 + 12 = 132$
4. You can always reverse the numbers being multiplied and the same result comes out. $12*2 = 2*12$, $8*7 = 7*8$, etc. This is a simple rule, but it's very easy to forget, so keep it in mind.
5. Anything multiplied by 2 is doubled, or added to itself, but you only need to do this up to 9. For example, $4*2 = 4 + 4 = 8$. Alternatively, you can count up by 2 that many times: $4*2 = 2 + 2 + 2 + 2 = 4 + 2 + 2 = 6 + 2 = 8$ To multiply any large number by two, double each individual digit and carry the result. Because you multiply each digit by 2 separately, the highest result you can get from this is 18, so you will only ever carry a 1, just like in addition. $\begin{matrix} 3 & 6\\ & 2\\ \hline & \\ & \\ \hline & \end{matrix}\quad \begin{matrix} 3 & 6\\ & 2\\ \hline 1 & 2\\ & \\ \hline & \end{matrix}\quad \begin{matrix} 3 & 6\\ & 2\\ \hline 1 & 2\\ 6 & \\ \hline & \end{matrix}\quad \begin{matrix} 3 & 6\\ & 2\\ \hline 1 & 2\\ 6 & \\ \hline 7 & 2 \end{matrix}$ This method is why multiplying anything by 2 is one of the easiest operations in math, and as a result the rest of our times table rules are going to rely heavily on it. Don't worry about memorizing these results - you'll memorize them whether you want to or not simply because of how often you use them.
6. Any number multiplied by 3 is multiplied by 2 and then added to itself. For example: $6*3 = 6*(2 + 1) = 6*2 + 6 = 12 + 6 = 18$Alternatively, you can add the number to itself 3 times: $3*3 = 3 + 3 + 3 = 6 + 3 = 9$
7. Any number multiplied by 4 is simply multiplied by 2 twice. For example: $7*4 = 7*2*2 = 14*2 = 28$
8. Any number multiplied by 5 is the same number multiplied by 4 and then added to itself. $6*5 = 6*(4 + 1) = 6*4 + 6 = 6*2*2 + 6 = 12*2 + 6 = 24 + 6 = 30$ Note that I used our rule for 4 here to break it up and calculate it using only 2. Once kids learn division, they will notice that it is often easier to calculate 5 by multiplying by 10 and halving the result, but we assume no knowledge of division.
9. Any number multiplied by 8 is multiplied by 4 and then by 2, which means it's actually just multiplied by 2 three times. For example: $7*8 = 7*4*2 = 7*2*2*2 = 14*2*2 = 28*2 = 56$
10. Never multiply anything by 12. Instead, multiply it by 10, then add itself multiplied by 2. For example: $12*12 = 12*(10 + 2) = 12*10 + 12*2 = 120 + 24 = 144$
11. Multiplying any single digit number by 9 results in a number whose digits always add up to nine, and whose digits decrease in the right column while increasing in the left column. $9 * 1 = 09\\ 9 * 2 = 18\\ 9 * 3 = 27\\ 9 * 4 = 36\\ 9 * 5 = 45\\ 9 * 6 = 54\\ 9 * 7 = 63\\ 9 * 8 = 72\\ 9 * 9 = 81$10, 11, and 12 can be calculated using rules for those numbers.
12. For both 6 and 7, we already have rules for all the other numbers, so you just need to memorize 3 results: $6*6 = 36\\ 6*7 = 42\\ 7*7 = 49$Note that $7*6 = 6*7 = 42$. This is where people often forget about being able to reverse the numbers. Every single other multiplication involving 7 or 6 can be calculated using a rule for another number.
And there you have it. Instead of trying to memorize a bunch of numbers, kids can learn rules that build on top of each other, each taking advantage of the rules established before it. It's much more engaging then trying to memorize a giant table of meaningless numbers, a task that's so mind-numbingly boring I can't imagine forcing an adult to do it, let alone a small child. More importantly, this task teaches you what math is really about. It's not about numbers, or adding things together, or memorizing a bunch of formulas. It's establishing simple rules, and then combining those rules together into more complex rules you can use to solve more complex problems.

This also establishes a fundamental connection to computer science that is often glossed over. Both math and programming are repeated abstraction and generalization. It's about combining simple rules into a more generalized rule, which can then be abstracted into a simpler form and combined to create even more complex rules. Programs start with machine instructions, while math starts with propositions. Programs have functions, and math has theorems. Both build on top of previous results to create more powerful and expressive tools. Both require a spark of creativity to recognize similarities between seemingly unrelated concepts and unite them in a more generalized framework.

We can demonstrate all of this simply by refusing to memorize our times tables.

## November 1, 2017

### Ignoring Outliers Creates Racist Algorithms

Have you built an algorithm that mostly works? Does it account for almost everyone's needs, save for a few weird outliers that you ignore because they make up 0.0001% of the population? Congratulations, your algorithm is racist! To illustrate how this happens, let's take a recent example from Facebook. My friend's message was removed for "violating community standards". Now, my friend has had all sorts of ridiculous problems with Facebook, so to test my theory, I posted the exact same message on my page, and then had him report it.

Golly gee, look at that, Facebook confirmed the message I sent does not violate community guidelines, but he's still banned for 12 hours for posting the exact same thing. What I suspect happened is this: Facebook has gotten mad at my friend for having a weird name multiple times, but he can't prove what his name is because he doesn't have access to his birth certificate because of family problems, and he thinks someone's been falsely reporting a bunch of his messages. The algorithm for determining whether or not something is "bad" probably took these misleading inputs, combined it with a short list of so-called "dangerous" topics like "terrorism", and then decided that if anyone reported one of his messages, it was probably bad. On the other hand, I have a very western name and nobody reports anything I post, so either the report actually made it to a human being, or the algorithm simply decided it was probably fine.

Of course, the algorithm was wrong about my friend's message. But Facebook doesn't care. I'm sure a bunch of self-important programmers are just itching to tell me we can't deal with all the edge-cases in a commercial algorithm because it's infeasible to account for all of them. What I want to know is, have any of these engineers ever thought about who the edge-cases are? Have they ever thought about the kind of people who can't produce birth certificates, or don't have a driver's license, or have strange names that don't map to unicode properly because they aren't western enough?

Poor people. Minorities. Immigrants. Disabled people. All these people they claim to care about, all this talk of diversity and equal opportunity and inclusive policies, and they're building algorithms that by their very nature will exclude those less fortunate than them. Facebook's algorithm probably doesn't even know that my friend is asian, yet it's still discriminating against him. Do you know who can follow all those rules and assumptions they make about normal people? Rich people. White people. Privileged people. These algorithms benefit those who don't need help, and disproportionately punish those who don't need any more problems.

What's truly terrifying is that Silicon Valley wants to run the world, and it wants to automate everything using a bunch of inherently flawed algorithms. Algorithms that might be impossible to perfect, given the almost unlimited number of edge-cases that reality can come up with. In fact, as I am writing this article, Chrome doesn't recognize "outlier" as a word, even though Google itself does.

Of course, despite this, Facebook already built an algorithm that tries to detect "toxicity" and silences "unacceptable" opinions. Even if they could build a perfect algorithm for detecting "bad speech", do these companies really think forcibly restricting free speech will accomplish anything other than improving their own self-image? A deeply cynical part of me thinks the only thing these companies actually care about is looking good. A slightly more optimistic part of me thinks a bunch of well-meaning engineers are simply being stupid.

You can't change someone's mind by punching them in the face. Punching people in the face may shut them up, but it does not change their opinion. It doesn't fix anything. Talking to them does. I'm tired of this industry hiding problems behind shiny exteriors instead of fixing them. That's what used car salesmen do, not engineers. Programming has devolved into an art of deceit, where coders hide behind pretty animations and huge frameworks that sweep all their problems under the rug, while simultaneously screwing over the people who were supposed to benefit from an "egalitarian" industry that seems less and less egalitarian by the day.

Either silicon valley needs to start dealing with people that don't fit in neat little boxes, or it will no longer be able to push humanity forward. If we're going to move forward as a species, we have to do it together. Launching a bunch of rich people into space doesn't accomplish anything. Curing cancer for rich people doesn't accomplish anything. Inventing immortality for rich people doesn't accomplish anything. If we're going to push humanity forward, we have to push everyone forward, and that means dealing with all 7 billion outliers.

I hope silicon valley doesn't drag us back to the feudal age, but I'm beginning to think it already has.

## October 10, 2017

### My Little Pony And The Downfall Of Western Civilization

Our current political climate is best described as a bunch of chimpanzees angrily throwing feces at each other. Many people recognize that there are many problems with modern politics, but few agree on what those problems actually are. Liberals, republicans, Trump, millenials, capitalism, communism, too many regulations, too few regulations, gerrymandering, illegal immigrants, rich people, poor people, schools, governments, religion, secularism, the list goes on and on and on. These, however, are not problems, they are excuses. They are scapegoats we have conjured up from our mental list of things we don't like so we can ignore the ugly truth.

At some point, Americans are going to have to admit that the entire problem with this country has been summed up in a TV show for six-year-old girls designed to sell toys. My Little Pony was released seven years ago, and as the series has progressed, it has focused more and more on reforming villains instead of defeating them. Time and time again, ponies refuse to give up on those who seem lost to darkness and try to figure out what is causing them to lash out. A central theme of the show is that almost no one is truly a "villain", only misguided, misunderstood, or pushed towards lashing out after a traumatic experience. While a select few villains have been show to be truly irredeemable, this is rare, which is in line with reality. Only a very small percentage of the human population is deliberately evil as opposed to simply lashing out, being stupid, or being tragically misinformed.

It is no longer possible to argue with anyone anymore. This is not because everyone suddenly became incapable of critical thought, but because no one can agree on any facts. When we built the internet, we thought having access to the sum of all human knowledge would bring infinite prosperity, but instead it brought us infinite misinformation. Russians have been making this worse, feeding false narratives to both sides to make us hate each other. It worked. When scientists themselves have been manipulated by corporations without anyone bothering to attempt to reproduce experiments, there simply isn't any good way to verify the truth of anything. The entire point of the scientific method is to make sure something is reproducible, but a staggering number of retractions in recent years has demonstrated that barely anyone actually checks anyone else's work. This has fostered a general distrust in science, even for results that have been reproduced thousands of times, like the thoroughly debunked "Vaccines cause autism!" claim.

This kind of political polarization is untenable. We no longer live in a world where we can get into a fight, stab someone else with a sword and call it good. If our political polarization goes unchecked, it will result in nothing less than the total collapse of western civilization. Humanity will have proven itself too dumb and tribalist to wield a tool as powerful as the internet. Whatever civilization comes after us will struggle to reclaim the technological progress we enjoy, now that we've stripped the planet of resources. If we fail now, humanity will never again be capable of reaching for the stars. We will have sentenced ourselves to live on this small rock until the sun boils the oceans away, doomed by our own stupidity.

There was an episode of My Little Pony that explained the origin of their country, Equestria. The three races, Pegasi, Earth ponies, and Unicorns, hated each other. Evil forces fed on their hatred, smothering the land in snow and threatening to freeze them all to death. So, each race set out to find a new land to colonize, only to suddenly realize that each of them had wound up on the exact same new continent. The leaders of each race immediately started yelling at each other, and the blizzard returned, until each of them was encased in ice. Only when the assistants of each leader realized they didn't actually hate each other were they able to dispel the evil forces by starving them of hatred and talking sense into their leaders. The moral of this story is very clear: either we figure out how to get along, or we're all going to die. I really, honestly don't know how to explain this better than a saturday morning cartoon show about magical ponies.

The problem is that I don't know if humanity is capable of moving past this. I've seen one of my friends rapidly devolve into insane conspiracy theory nonsense, and I simply don't have the mental willpower to engage with them. I eventually had to block them, and accomplished two things at once: reinforcing their echo chamber and reinforcing my echo chamber. I tried to hold on to them as a window into conservative nonsense so my twitter wasn't a complete echo chamber, but when the other side is saying truly horrible things about you, this becomes more and more difficult. It also make it more likely for me to say truly horrible things about the other side, in a vicious, endless cycle, and I simply have too many other things to worry about to be capable of dealing with that level of toxicity. At this stage, I'm not sure humanity has the strength to actually reconcile with itself. I think there is a real possibility that our worries about AI were misplaced - the technology that might ultimately destroy us could be the internet, simply because our tribalist brains are too desperate to find someone to hate. We may be fundamentally incapable of sustaining a global, interconnected society with instantaneous communication.

At least then we'll have a very definitive answer to the Fermi Paradox.

## September 5, 2017

### I Used To Want To Work For Google

A long time ago I thought Google was this magical company that truly cared about engineering and solving problems instead of maximizing shareholder value. Then Larry Page became CEO and I realized they were not a magical unicorn and lamented the fact that they had been transformed into "just another large company". Several important things happened between that post and now: Microsoft got a new CEO, so I decided to give them a shot and got hired there. I quit right before Windows 10 came out because I knew it was going to be a disaster. More recently, it's become apparent that Google had gone far past simply being a behemoth unconcerned with the cries of the helpless and transformed into something outright malevolent. It's silenced multiple reporters, blocked windows phone from accessing youtube out of spite, and successfully gotten an entire group of researchers fired by threatening to pull funding (but that didn't stop them).

This is evil. This is horrifying. This is the kind of stuff Microsoft did in the 90s that made everyone hate it so much they still have to fight against the repercussions of decisions made two decades ago because of the sheer amount of damage they did and lives they ruined. I'm at the point where I'd rather go back to Microsoft, whose primary sin at this point is mostly just being incompetent instead of outright evil, rather than Google, who is actually doing things that are fundamentally morally wrong. These are the kinds of decisions that are bald-faced abuses of power, without any possible "good intention" driving them. It's vile. There is no excuse.

As an ex-Microsoft employee, I can assure you that at no point did I think Microsoft was doing something evil while I was there. I haven't seen Microsoft do anything outright evil since I left, either. The few times they came close they backed off and apologized later. Microsoft didn't piss people off by being evil, it pissed people off by being dumb. I was approached by a Google recruiter shortly after I left and I briefly considered going to Google because I considered them vastly more competent, and I still do. However, no amount of engineering competency can make me want to work for a company that actively does things I consider morally reprehensible. This is the same reason I will never work for Facebook. I've drawn a line in the sand, and I find myself in the surprising situation of being on the opposite side of Google, and discovering that Microsoft, of all companies, isn't with them.

I always thought I'd be able to mostly disregard the questionable things that Google and Microsoft were doing and compare them purely on the competency of their engineers. However, it seems that Google has every intention of driving me away by doing things so utterly disgusting I could never work there and still be able to sleep at night. This worries me deeply, because as these companies get larger and larger, they eat up all the other sources of employment. Working at a startup that isn't one of the big 5 won't help if it gets bought out next month. One friend of mine with whom I shared many horror stories with worked at LinkedIn. He was not happy when he woke up one day to discover he now worked for the very company he had heard me complaining about. Even now, he's thinking of quitting, and not because Microsoft is evil - they're just so goddamn dumb.