JavaScript is disabled. Some features will not work.Quick Math3+4+5+6+7+8= 3+4+5+6+7+8 =3+4+5+6+7+8=2363323343You might also likeJavaScript is disabled. Some features will not work.The Halting Problem!Need a quick buck? A while ago someone offered $1000 for a developer to “create a debugger program. This program will take as input the source code of another program, and will analyze that other program and determine if it will run to completion, or have an error, or go into an infinite loop.”What do you think — would you take the contract?Yes!No!464 learnersJavaScript is disabled. Some features will not work.One-time pads 🕵️♀️Your field operative Alice sends you a top-secret message: hqsoew. Many past spies have been executed after their messages were deciphered. But this time, you and Alice are using a one-time pad — the simplest and most secure cipher that exists!In this tutorial, you’ll learn how to decipher Alice’s message, and save Alice and your country along the way.Let’s save the nation! 💪279 learnersJavaScript is disabled. Some features will not work.The quadratic formula: a tutorialSo you need to solve 2x2−3x=2\def\A{\red{A}} \def\B{\blue{B}} \def\C{\green{C}} 2x^2 - 3x = 22x2−3x=2. You remember the word ‘quadratic’ and something like 4ac−b2\def\A{\red{A}} \def\B{\blue{B}} \def\C{\green{C}} \sqrt{4ac - b^2}4ac−b2 … or was it +b2\def\A{\red{A}} \def\B{\blue{B}} \def\C{\green{C}} +b^2+b2? 😨Stop trying to memorize the quadratic formula! In this interactive tutorial, you’ll rediscover the quadratic formula with me, and you’ll never have to memorize it again! 💪Okay, let’s go!5303 learners
JavaScript is disabled. Some features will not work.The Halting Problem!Need a quick buck? A while ago someone offered $1000 for a developer to “create a debugger program. This program will take as input the source code of another program, and will analyze that other program and determine if it will run to completion, or have an error, or go into an infinite loop.”What do you think — would you take the contract?Yes!No!
JavaScript is disabled. Some features will not work.One-time pads 🕵️♀️Your field operative Alice sends you a top-secret message: hqsoew. Many past spies have been executed after their messages were deciphered. But this time, you and Alice are using a one-time pad — the simplest and most secure cipher that exists!In this tutorial, you’ll learn how to decipher Alice’s message, and save Alice and your country along the way.Let’s save the nation! 💪
JavaScript is disabled. Some features will not work.The quadratic formula: a tutorialSo you need to solve 2x2−3x=2\def\A{\red{A}} \def\B{\blue{B}} \def\C{\green{C}} 2x^2 - 3x = 22x2−3x=2. You remember the word ‘quadratic’ and something like 4ac−b2\def\A{\red{A}} \def\B{\blue{B}} \def\C{\green{C}} \sqrt{4ac - b^2}4ac−b2 … or was it +b2\def\A{\red{A}} \def\B{\blue{B}} \def\C{\green{C}} +b^2+b2? 😨Stop trying to memorize the quadratic formula! In this interactive tutorial, you’ll rediscover the quadratic formula with me, and you’ll never have to memorize it again! 💪Okay, let’s go!
