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How To: Calculate math without a calculator

Before the calculator and even the abacus was invented, there was a little instrument called the human brain that we used to do math. Remember that? While most of us turn to our trusty Ti-84s to do calculus homework or whip out our cell phone calculators to determine how much we should tip at Johnny Rocket's, it can often be much faster to use our own brains, along with a piece of paper and pencil.

How To: Make a favicon for your site in Photoshop CS3

In this Computers & Programming video tutorial you will learn how to make a favicon for your site in Photoshop CS3. A favicon is a little symbol that shows up on url bars and also on browser tabs. Open a new project in Photoshop by pressing ctrl+N. Select height and width to 64 pixels and click OK. Now open the title tool and type in whatever you want. In the video, it is ‘F’. Open the background layer and do a color overlay of black. Now change the color of the title to white so that it ...

How To: Draw a Lewis dot structure for nutrite anion

This video shows you how to draw the Lewis electron dot structure for the nitrite anion- first you start by drawing the symbols o, n and o, in that order, and then you proceed to draw two dots on the top of the n, and one on each other side.On the 'o' on the far left, you draw two dots on the top, and two dots on the left, putting just one dot on the bottom and the left- the right 'o' mirrors this pattern.Next you link all three letters with two lines, using the single dots on the left and ri...

How To: Orient a map and use a compass as a Boy Scout

Second Class Boy Scouts work on building their outdoor survival and camping skills. Compass work, nature observation, camp tools, and swimming are areas where new skills are mastered and demonstrated. A second class scout, having completed all the requirements, should be able to lead a hike, care for his own equipment, set up a campsite, and perform basic first aid.

News: What Are Superbugs? Everything You Need to Know About Antibiotic Resistance

Joe McKenna died when he was 30 years old. A young married man with his future ahead of him, he was cleaning up the station where he worked as a fireman. Struck by a piece of equipment fallen from a shelf, Joe complained of a sore shoulder. Over the next week, Joe worsened and ended up in the hospital. Chilled, feverish, and delirious, his organs shut down from an infection we'd now call septic shock.

Tutorial: Create Wordlists with Crunch

Greetings all. Before I get into the tutorial, I would like to mention that I am fairly new to Null Byte (been lurking for some time though), and what really appeals to me about this place is its tight, family-like community where everyone is always willing to help each other and the constant search for knowledge that inhabits this subdomain is a driving motivator for me to join in. I'm glad I arrived at the right time. Anyway, wipes tears (not really)...

How To: Upload a Shell to a Web Server and Get Root (RFI): Part 2

If you remember last time, we successfully uploaded picture with a small hidden PHP command executer embedded in it onto a server. Now, our goal is to take this a step further and get an interactive shell. To do this, we need to upload another file that either binds a port for us, or connects back. For this tutorial, we will use a Python reverse Meterpreter shell.

How To: Set an alarm on an iPhone with the built-in clock

With all of the technology available today, which do you use to be your personal alarm clock? You can have a huge, bulky alarm clock, you can use your computer, and you can have one of those small, portable analog clock, but why use them if you have an iPhone? The iPhone has a built-in alarm clock that's perfect for cutting down on the bulk of life. So, how do you use it? Best Buy has answers. The Best Buy Mobile team explains how simple it is to set an alarm on an iPhone with the built-in cl...

How To: Copyright a book

You've written the great American novel, and you want to make sure that your story stays yours. Register your copyright and preserve your intellectual rights. In this video, learn how to copyright produced material.

How To: Find & extract duplicate records from a data set

This video is about finding duplicate entries in excel sheet. The example excel sheet contains different names. There are around 1000 different names in the sample excel sheet. CountIf(range,criteria) formula has been used to do the comparison and return of results in True or False mode. Type =CountIf( now move your left arrow key, this will generate the formula like =CountIf(A2. Now press Ctrl+Shift+Down arrow, this will select all the available values in the column. Now press F4 to lock it ...

How To: Make a rotating SWF logo in Photoshop

This video shows how to make a rotating SWF logo in Photoshop. Choose any desired logo that will be used later in the SWF file. Save the logo to the desktop. Use any kind of editing pogram. Make sure we only have what we want showing the area coloured with small squares is invisible. Open any version of Adobe Flash. Create a new "Actionscript 2" file. Then set workspace size to 240X320 and background color to match the picture we choose before. Make sure we select Flash Lite 2.0. Then go to F...

How To: Graph linear inequalities

In this video the instructor shows how to graph linear inequalities. A linear in a equation is almost similar to a linear equation except for the sign in the equation. Now treat the in equation as a linear equation and graph the line. So substitute the lesser than or greater than symbol in the liner in equation with the equals to sign and graph the equation. Find the slope of the equation and identify the points that the line passes through. Now take a point on the either side of the pointed ...

How To: Create a skewed checkerboard pattern in Illustrator

Check out this simple Adobe Illustrator CS4 tutorial to learn how to create a skewed checkerboard pattern. This technique will save you the trouble of having to use the Option and Drag method multiple times. Veerle Pieters expertly takes you through this easy pattern technique. For more Adobe Illustrator tutorials, search for Illustrator on WonderHowTo.

News: You're Eating Mold & You Don't Even Know It

Koji is a culture made up of a certain fungus (mold) called Aspergillus oryzae, which has been used to ferment rice and soybeans in Japanese, Chinese, and Korean kitchens for centuries. Koji can actually have other involved fungi, but Aspergillus oryzae is the most common, and therefore the names can be used interchangeably. Its end purpose is to enhance the flavor of items like soy sauce, sake, and miso.

How To: Give Songs Star Ratings on Your iPhone

Back in iOS 8.4, Apple introduce a new "heart" icon in their Music app, which works in direct correlation with their Apple Music service that was released at the same time. By hearting a song, you're telling Apple that you love that song, and they can make better suggestions for you (in the "For You'" tab) based on it.

How To: Share Albums in Google Photos

There's a feature in Google's Photos app for Android, iOS, and the web that lets you create shared albums with your friends and family. It's really a useful feature that makes it fun and easy to collaborate on an album with a person or persons of your choosing.