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How To: Who's Unfollowing Your Twitter Account? Find Out with These Tracker Apps (And Get Revenge!)

Feelings can get hurt on Twitter as fast as an update. Everything is fine and dandy because two people are mutually following each other, then out of nowhere, one person has unfollowed the other out for seemingly no reason. Twitter doesn't notify users when someone has unfollowed them, so there are millions of people out there who get used for their follow! Well, now you can find out who unfollows you on Twitter with these mobile apps.

How To: Want Detailed Flight Data for Your Backyard Rocket? Use Your iPhone

Rockets will always be cool no matter what age you are, and building your own rocket is even better. If you have an iPhone that you aren't afraid to blast off into the sky, then you can try and build your own iPhone Rocket to record and analyze flight data, like Byte Works did. The list of parts is a little hefty, but their blog provides you with all of the information you need to make sure you have everything. The most important thing you need is the sensor tag, so that you can record the am...

Meet Tanky: The Super Smart DIY Tank Robot That Can Map Its Own Surroundings

There are plenty of tank robots out there, but how many of them can recognize 3D objects and map their environment? Tanky, the tracked mobile robot, can do all that and more while rolling around on his bicycle chain treads. Created as a Master's thesis project, Tanky is made almost entirely of parts you can find at your local hardware store. It was built in two "layers" with the motors, electronics, and batteries on bottom and the processing unit, a laptop, on top. The motors came from cordle...

How To: Make Your Night Bike Glow in the Dark with Phosphorescent Paint

With gas prices constantly digging into your wallet, biking will always be a cheap and easy alternative for getting around—and it's a perfect way to get in a little exercise. But with the fall season about a week away, it is going to start getting dark a lot earlier and that ride home might be a little more dangerous. So to save yourself an unexpected trip to the ER, take a little time to make your bicycle impossible to overlook.

News: This Giant Glass Globe Turns Moon and Sunlight into Power—Possibly Even Solar Death Rays!

André Broessel of rawlemon has developed a solar energy generator that can use both sun and moonlight to create usable power. Oh... and it's gorgeous. The device is essentially a huge glass sphere filled with water that uses a ball lens to refract light in a way that increases energy efficiency by 35 percent. It's completely weatherproof and has an optical tracking device, meaning that it can be incorporated into architecture. Here's a concept design of how it could be used to power buildings...

News: Windows 8 Reports Your Downloads to Microsoft, But Is It Really a Security Threat?

Security researcher Nadim Kobeissi has discovered that the Windows 8 SmartScreen feature, meant to screen downloads for malicious software, actually reports the data about which applications users are installing to Microsoft. He also says that "the Microsoft server is configured to support SSLv2 which is known to be insecure and susceptible to interception." The two main concerns are the ability of law enforcement to subpoena Microsoft for the information and of hackers to intercept user data...

How To: Find Out What Personal Data Your Mobile Apps Are Leaking with Mobilescope

If you use apps on your smartphone, chances are you have no idea what those apps are doing with your information. Just this year, there have been several scandals involving apps transmitting user data, like Path uploading users' entire address books onto its servers, HTC's Security Flaw, and Brewster exposing users' personal information (even Ashton Kutcher's). A new service called Mobilescope wants to make sure you always know where—and to whom—your data is going. Lots of apps copy your cont...

News: This Real-Life, Working WALL-E Robot Is Absolutely Perfect (And Built Entirely from Scratch)

Want to build your own life-sized, working replica of WALL-E? Be prepared to take on a second job! Mike Senna spent two years perfecting his own version, working 25 hours a week and totaling somewhere around 3,800 hours for the whole project. He had no blueprints to go by, so he spent a lot of time watching the movie over and over to get everything just right. The video below shows some of the construction; skip to about the one minute mark to see WALL-E in action.

News: Inklewriter Lets You Write and Share Your Own 'Choose Your Own Adventure' Books

Remember those Choose Your Own Adventure novels? If your school was anything like mine, they were so popular you were lucky to find one to check out at the library. But there's no worries now, thanks to this handy HTML5 app, which makes it easy to write and share your own 'choose your own adventure' novels. inklewriter is a free tool designed to make writing interactive stories simple. Basically, you start typing and inklewriter helps you organize your story, making it easy to add, remove and...

How To: Right click on the Macbook Pro

While the Macbook Pro track pad is a dream to use, it may not be immediately apparent on how to access the secondary, or "right click" menu. This video gives you a visual demonstration on how to right click using the two finger tap method. Note, it is important you check your System Preferences > Track pad preference pane to ensure secondary tap is the selected option. You can access the System Preferences by clicking on the Apple in the very top left hand corner of your screen and selecting ...

How To: Change your vehicle's brake pads

In this automotive repair video, you'll learn how to change your own brakes. Throughout this process, you'll also figure out how to remove your tire, calipers and brake pads, and how to clean the brake pad area. See how to take off the rotor and reinsert everything correctly. It's an easy process, and you don't need to be a professional mechanic to install new brake pads.

How To: Knead, rise and shape bread dough

First of all you have to be very patient while kneading dough. You need a lightly floured surface to press the dough. Use the heel of your hand to knead the roll down and away in a rolling motion. Give the dough a quarter turn then fold it over and then push it down.

How To: Input values & formulas into a cell in Excel macros

This video shows how to enter values into cells using Excel macros and Visual Basic. This includes a sample Expense Report that is used in this demonstration. In this demonstration, we will create the macro that inputs a title as "Expense Report", Three columns i.e. "Date", "Item" & "Amount", and the summery field as "Total Expenses", as well as the formulas located at the respective cells. Now, we're going to use two keyboard shortcuts i.e. "Alt + F11" to open-up the VBA window and "Alt + F8...

How To: Unpack and assemble a new bicycle

Bill D., the tech lead at all3sports.com takes us through the steps involved in unpacking and assembling a brand new bicycle. The first he says is to set up or insert the seat post. He recommends using a work stand if you have one at home. He says not to unpack everything at the beginning, but to just expose the seat pack first. Use a wire-cutter to get rid of the film protection used for packing. He has mounted the frame-set on the work stand. The seat post goes into the frame-set. He asks t...

How To: Calculate interest rates for payday loans in MS Excel

The video demonstrates the way of calculating the interest rates for payday loans using MS Excel. The person presenting the video has got his MS Excel sheet with all the formulas and data ready. He first starts with the nominal & effect & future value tab. He gives us an example where you give the lenders a check of $250 that has a date 25 days in future and get $200 loan today. Now he teaches us hot to calculate APR and EAR. HE has got the data ready there, the period of the loan which is 25...

How To: Calculate the circumference of a circle

This video shows how to calculate the circumference of a given circle. The video first describes the circumference or perimeter of a circle as the distance around the outside of a circle. To find the circumference we need either the radius or the diameter of the circle. When you know the diameter of the circle, the formula to find the circumference denoted by 'C' is 'pi' times the diameter, where 'd' is the diameter and 'pi' is a constant, the approximate value being 3.14. And when you are gi...

How To: Use implicit differentiation

Taking this formula 9x²+y²=9 your instructor shows you how to find the solution for the variable y. Finding a second derivative is no more difficult that finding the first derivative, you only have to do the problem equation through twice. The derivative of 9x² will be 18, of y² will be 2y [this is the same as 2(y), 2 x y or 2 * y]. The problem now goes -18x + 2y dy/dx=0. This equation is solved for dy/dx making the next step in the problem go -18x 18x+2y dy/dx=0-18x, 2y dy/dx= -18x. The next...

How To: Graph square root functions & inequalities

On Yay Math, Robert Ahdoot, founder of Yay Math, will show you some square root functions and some inequalities. He begins with the problem y=x². Then he makes a sketch with two intersecting lines in a t shape. The problem is illustrated by a curved U shape, the U's bottom resting on the horizontal bar, which represents x, while the center takes the vertical line. The vertical bar represents y. This U is directed up because the x² is a positive number. If the number were negative, the U would...

How To: Solve a linear system by elimination method

This video is about using the elimination method to solve a linear system. The lady presenting this video says that elimination method means that one of the two variables has to be eliminated while adding up the two linear equations. She then explains the example equations 6x-2y=66 and 5y=-29-2x. She asks you to first line up x and y. So the second equation is rewritten as 2x+5y=-29. Then she says that, to eliminate a variable, we should have their variables equal in value but of opposite sig...

How To: Make a ribbon gift bow

Choose ribbon in an appropriate color, texture and width. Are you trying to match the ribbon color to a particular gift wrap? Will the ribbon width give you the size bow you want? How will you be using the bow?