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How To: Make a Hyperbolic Paraboloid Using Skewers

In Monday's post, we created a sliceform model of a hyperbolic paraboloid. In today's post, we will create a similar model using skewers. The hyperbolic paraboloid is a ruled surface, which means that you can create it using only straight lines even though it is curved. In fact, the hyperbolic paraboloid is doubly ruled and is one of only three curved surfaces than can be created using two distinct lines passing through each point. The others are the hyperboloid and the flat plane.

Modular Origami: How to Make a Truncated Icosahedron, Pentakis Dodecahedron & More

Last post, the Sonobe unit was introduced as a way to use multiple copies of a simply folded piece of paper to make geometric objects. In this post, we are going to explore that concept further by making two more geometric models. The first is the truncated icosahedron, which is a common stitching pattern for a soccer ball. The second was supposed to be the pentakis dodecahedron, but through systematic errors last night, I actually built a different model based off of the rhombic triacontahed...

Modular Origami: How to Make a Cube, Octahedron & Icosahedron from Sonobe Units

Modular origami is a technique that can be used to build some pretty interesting and impressive models of mathematical objects. In modular origami, you combine multiple units folded from single pieces of paper into more complicated forms. The Sonobe unit is a simple example unit from modular origami that is both easy to fold and compatible for constructing a large variety of models. Below are a few models that are easy to make using this unit.

Math Craft Monday: Community Submissions (Plus Polyhedral Stellation)

It's another Monday, which means it's once again time to highlight some of the recent community submissions posted to the Math Craft corkboard. Additionally, I thought we'd take a look at the process of stellation and make some stellated polyhedra out of paper.Rachel Mansur of Giveaway Tuesdays posted a video from animator Cyriak Harris, which zooms into fractal hands, where each fingertip also has a hand and fingers. A few more details can be found here, as well as some other really cool pic...

News: Should Kids Be Allowed to Use Facebook and Google+?

It's a question I've been pondering a lot lately. Technically, children under the age of 13 are not allowed to join Facebook. But according to a Consumer Reports in May, 7.5 million children 12 and younger are already on the site. Currently, federal law prohibits websites from collecting personal data from children without parental permission. The Children's Online Privacy Protection Act, or COPPA, as it is more commonly known, has been in effect since 1998, but has not been updated since.

News: The Best Places to Play Scrabble Online

There's nothing better than playing a game of Scrabble, feeling the smooth wooden tiles in your hand and savoring the heavy fumes of cardboard, cheap wood and plastic as you rearrange the letters on your rack into the perfect word. You try to keep a straight face while you watch your opponent sweat, but you can't help but release that diabolical grin of self-admiration as you play the elusive triple-triple. The score's recorded and you feel sorry for your bitter rival, but then you remember y...

Google+ Pro Tips Round-Up: Week 3

Now that you can invite anyone you want to Google+, the floodgates are open. If you've been bummed out about not being able to share the joys of Google+ with your friends and acquaintances, make use of that handy envelope icon the right side of your stream page. Just enter the email addresses of the people you want to invite, and hit the "Invite" button.

How To: Silence Phone Calls from Annoying Friends and Spammy Callers

Everybody has them. You can say you don't, but it's probably a lie. There's at least one person on your mobile phone that you never, ever want to pick up the phone for. When they call, you cringe and immediately hit the silent button. They're annoying. Overbearing. You hate them, but yet you love them enough to not delete them entirely from your contact list. Maybe if they called just once a week, but once a day is just too much for you to handle. What do you do?

News: Networking Virtual Machines Using VDE

I've struggled for a long time trying to set up a virtual network between my KVM virtual machines. I tried several forums and tutorials on the web, but still on my system it just wouldn't work. I eventually got it owrking, so I've decided to make some notes of my own. Hopefully it will be helpful to you as a reader as well.

Adult Swim Games: It's Not Just for Aqua Teen Anymore

The days of having to pay for video games are over. Generally, retail games are better because they're made with more effort and care than their free counterparts. But free browser-based game sites are insanely popular, specifically Kongregate, Armor Games, and the grandaddy of them all—NewGrounds. Despite not receiving funds directly from the players, they’ve become a profitable niche in the games industry. And that popularity has attracted more talent and money to the production of web game...

News: Attack Balloons and SuperMonkeys: A Tower Defense Retrospective

Real-time strategy (RTS) was the most popular genre in PC games at one time. It put Blizzard on the map—one of the biggest game developers in the world. And it buried the once venerable turn-based strategy genre, the only survivor being the Civilization series. But like hair metal in the late ‘80s, RTS reached its saturation point. Many bands (games) were too similar and used ornamentation over innovation. Suddenly, the fans left. From ’95 to ’03, Command & Conquer releases were more like new...

How To: Create Strong, Safe Passwords

Movies like to show hackers breaking passwords with fancy software and ludicrous gadgets. The reality of busting passwords open is much more mundane. Simple as it may sound, most passwords are broken purely by guesswork. Check out this infographic from ZoneAlarm, as well as this list from the Wall Street Journal of the fifty most common passwords gleaned from the 2010 Gawker hack. If your password is on one of those lists, you need to change it. Right now.

News: Are You Noob-Positive or Noob-Negative?

noob - Short for "newbie." Someone with little to no experience or skill. In some gaming communities, there is fierce debate over the distinction between "noob" and "newb"—one being derogatory while the other simply indicates being a novice. While some may argue the semantic differences, "noob" is the most common spelling seen around the internet, for both purposes.

Project Cafe: The Specs Behind Nintendo's Newly Rumored Console

In the past 25 years, there have been five generations of home video games systems. Since Nintendo changed the world by releasing the NES in 1987, there has always been at least two consoles competing for dominance in the wild west of the games industry. This competition— coupled with rapid advancements in technology—has led to a new generation of battling systems coming out every five years, like clockwork.

News: Amazon Mechanical Turk

It's really a shame that it is so hard for people to make money on the internet these days. The dot com bubble has receded and scams are plentiful on the web. There are, however, a couple of legitimate ways to make a few extra bucks online, Amazon Mechanical Turk, or MTurk for short, is one of them. The idea of MTurk is to hook up programmers with people that do tasks that computers can not, these tasks are called HITs (Human Intelligence Task). These tasks include article creation, creative ...

How To: Start Developing Websites

How To Start To start developing website is a hard way to tell people depending on what they are best at. I'd like to describe a few of 'em. I will call them a few names depending on what effect comes out of 'em. And I will describe what developing languages there are out there and are most widely used. Let's start with that for now.

Swim Better, Swim Faster: Lessons from the Gay Army Tri Swim Coach

By Louis Tharp RealJock.com is pleased to present this first in a series of articles on improving your swimming form and performance from Louis Tharp, out gay man, swim coach for the Army Triathlon Team at the U.S. Military Academy at West Point, and author of the new book Overachiever's Diary: How the Army Triathlon Team Became World Contenders. Tharp is the first out gay coach in the history of West Point.

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