In mathematics, a knot is a closed circle in a three-dimensional space that crosses itself multiple times. Since it is closed, it has no ends to tie, meaning you can't actually create such a knot. However, if you tie the ends together after you create a knot in the standard way, you will have something that is close to the mathematical description. In this post, we will explore the creation of mathematical knot sculputures using copper tubing and solid solder wire.
Last week's Community Byte we got off to a great start! We had a few people build our IRC bot, and all went well. We had some great contributers, ideas, and people willing to learn. So, needless to say, we will be having another. Let's try to get a few more people involved this time!
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.
It may not seem like it, but it's been less than 90 days since Google+ was introduced to the world. Since then, we've seen many great features that have made Google+ one of the most attractive social networks around. Today, we've received even better news: major improvements and feature updates that are truly innovative.
Hangouts are one of the most fun features in Google+. As long as you have a webcam and a microphone, you can "hangout" with up to 10 of your buddies on Google+ and do just about anything. Of course, sometimes it can get kind of awkward when you are hanging out and you don't really have anything to say. This problem can be mitigated if you host hangouts with a plan.
Although circles are Google+'s answer to the problem of social network relationship management, that's not the only thing it's good for. People on Google+ are using circles for all sorts of creative activities, some of which aren't obvious as first glance.
Stewart Butterfileld is one of the last great old-fashioned tech billionaires. He founded Flickr, and then sold the company to Yahoo! for a stupendous amount of money in 2005. Like Mark Cuban and others before him, he was left wondering what to do with the rest of his long and fabulously wealthy life. Cuban bought the Dallas Mavericks and turned them from unabashed losers into beloved champions. Butterfield decided to try his hand at game design (something he had attempted with the ambitious ...
Do you ever really know someone? I mean really really? Super really? Sometimes we can talk and be with people normally for years and then bam: five people dead, house on fire, dog missing. All the while people shake their heads and regret that if they had just put the little clues together all of this could have been averted.
Time is running out. Christmas is almost here, and you still haven't worked your way through that holiday shopping list yet. But don't worry, there's hope yet— thanks to social buying websites like Groupon, LivingSocial, SocialBuy, Eversave, Tippr and BuyWithMe.
If you need to build a SQL query, you can choose one of two alternatives. The first and a rather old way is using a console. But if you build your queries in MySQL console, you have to remember all the commands and keys. This is not a convenient way, because query execution is a time-consuming process. Another way is to use some graphical interfaces for MySQL. It can fulfill many developers' requirements, including query execution.
I love circular needles! I use a circular most of the time, even when I am knitting straight. One of the reasons I love knitting on a circular is because with a circular needle, you don't have to worry about dropping a needle. You just have one. It's particularly good to knit straight on a circular needle when you're making a large project such as an afghan or blanket, but I use one even if I'm knitting a small project such as a scarf or wash rag. The photo below is of a scarf I'm making with...
Pull ToyI love dogs, but the toys can get really expensive. This is an easy to make, inexpensive way to make a toy that really works. My dog loves it! The materials you will need is an old dish towel and a pair of scissors.
Join chef Sarabjit Singh of Side Wok in Malcha Marg, New Delhi, as he prepares a nice and tasty spicy starter dish. Learn how to make Thingming mushroom starters.
Do you want to be a magician? Well then join Ryan Oakes and his assistant Damian as they show you a great card trick called Cutting the Deck! You will need one deck of cards, a pencil and a piece of paper. Sometimes we use materials that require adult supervision... like scissors, so make sure you have friends and family around whenever you do magic tricks. 1. Preparation: Take a look at the top card of the deck (make sure it’s shuffled beforehand) and then write the name of the card on the p...
No magic show would be complete without the famous sawing in half trick. So grab a straw and a piece of string and come join the fun! You will need a straw, a piece of string and a
Soldering copper pipes is a basic plumbing skill that once mastered will enable you to tackle many DIY home repair and home improvement projects - for instance, replacing copper water lines or installing a new spigot. It can be as much an art as it is a science, thus the more you get the "feel for it," the faster and easier it gets.
Have you ever heard of Jamaica? Of course you have. It's that island right next to Cuba and Haiti. Well, that's not really what I'm talking about though. I'm talking about the board game Jamaica. This video series will show you how to play the board game with a presentation of the playing cards, the game round, the action types, combat, cost of spaces, penury, treasures, and the end of the game.
In this video, This Old House landscape contractor Roger Cook explains how to prune and train rose bushes.
Watch this video from This Old House to learn how to install an under-sink water filter. Steps:
Watch this video from This Old House to learn how to solder copper pipes. Steps:
Watch this video from This Old House to learn how to replace your exterior columns. Steps:
Paper is something we use everyday. Whenever we think about paper, mostly nothing comes to our minds more than reading and writing on paper! However, that's not all. There are lots of things that may come out of papers. Hundreds of ideas and uses that paper can MAGICALLY provide! Well, it's not really magic.. It's something that needs some simple learning and some small working and there you will have many lovely things just coming out of paper!
Have a few light bulbs and a blowtorch? Then join the folks over at Harvard in a cool science experiment on the conductivity of glass. As you well know, glass is an insulator with low conductivity and high resistivity. In the video below, they flip the switch, demonstrating how heating the glass fuse enclosure from an incandescent light bulb can create a conductive material that completes the series circuit and lights the second light bulb. In the video, the two light sockets are wired in ser...
Welcome to Minecraft World! Check out our tutorials, post to the community corkboard, and come play on our free server!
Welcome to Minecraft World! Check out our tutorials, post to the community corkboard, and come play on our free server!
Sunday, April 29, 2012 2:00pm until 6:00pm
If you're a frequenter of Null Byte, I bet you have at least some interest in information security. Furthermore, you have a hobby that if applied in certain ways, will get you arrested. I've received quite a few messages from the community here about federal cybercrime law and how it applies to them, so I decided to get together with my lawyer to come up with some answers.
Remember that scene in The Matrix when Trinity uses a realistic Nmap port scan, followed by an actual SSH exploit (long since patched) to break into a power company? Well, believe it or not, but that scene is not far fetched at all. If you want to exploit vulnerabilities and root boxes, you'll need to learn how to perform the necessary reconnaissance first. In fact, you will spend far more time researching your target then you will exploiting it. In this article, I am going to show you the fi...
Welcome to the Mad Science World! Hold onto your radiation-shielded hard hats—we're going to be posting a ton of great how-to articles and videos every week, showcasing the maddest of the mad science experiments on the web. We hope you will be inspired to try these projects at home, but always remember—safety first!
Last Friday's mission was to accomplish solving HackThisSite, realistic 4. The fourth in a series of realistic simulation missions was designed to be exactly like a situation you may encounter in the real world. This time, we are told "Fischer's Animal Products is a company that slaughters animals and turns their skin into overpriced products which are then sold to rich bastards! Help animal rights activists increase political awareness by hacking their mailing list."
Last Friday's mission was to accomplish solving HackThisSite, realistic 3. The third mission in a series of realistic simulation missions was designed to be exactly like situations you may encounter in the real world, requesting we help a friend restore a defaced website about posting peaceful poetry.
If you're on a tight budget for food, whether you're in college, or someone just starting out living on their own, you're probably low on money and sick of ramen noodles. Don't get me wrong, ramen can be tasty and filling, and there is almost nothing cheaper.
Welcome to Minecraft World! Check out our advanced tutorials and come play on our free server. Redstone can add a lot of exciting effects to your gameplay, but not all usage of redstone has to be flashy to achieve a cool effect. For this Saturday's Weekly Workshop, we're going to be going over a more nuanced subject in Minecraft: hidden lighting.
If you're into entomology, then you probably recognize the name E.L. Trouvelot. After all, he was the person responsible for the outbreak of invasive gypsy moths in North America, which are now one of the most destructive foliage-eating pests in the United States.
Last Friday's mission was to accomplish solving HackThisSite, basic mission 10. This mission teaches us how to use JavaScript to manipulate cookies on poorly coded cookie-based authorization.
It’s been a fun week here at Edit on a Dime, and not just because I drove around LA for an hour with an iPhone taped to the hood of my car for a review. Here’s what I was up to:
Friday's mission was to accomplish solving HackThisSite, basic mission 7, which required us to learn some basic Unix commands. If you have any prior experience using Unix commands, this should be a breeze for you if you sit and think for a second.
Erik Demaine is a Professor of Electronic Engineering and Comp Sci at MI, but he is also an origami folder who has had work displayed at the Museum of Modern Art in NYC. He makes some beautiful models and intricate puzzles, but in my opinion the really inspirational work is the curved creased models. In Erik's own words describing the above models: "Each piece in this series connects together multiple circular pieces of paper (between two and three full circles) to make a large circular ramp ...
Welcome to Minecraft World! Check out our advanced tutorials and come play on our free server.
Last week Math Craft admin Cory Poole demonstrated how to make three of the platonic solids from Sonobe units: the cube, the octahedron, and the icosohedron; but where was the dodecahedron? I was pushed to find out how to make a sonobe dodecahedron from this beautiful picture (below) that Rachel Mansur posted on the corkboard.
