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How To: Multiply matrices with the MMULT function in MS Excel

Looking for a primer on how to create and work with array formulas in Microsoft Office Excel? You've come to the right place. In this free video tutorial from everyone's favorite MS Excel guru, YouTube's ExcelIsFun, the 12th installment in his series of Excel array formula series, you'll learn how to use the array function MMULT to multiply multiple matrices in matrix algebra. (NB: This is an array function that requires the Ctrl + Shift + Enter trick.)

How To: Play racquetball for beginners

Racquetball is not very complicated, but it does require a bit of practice and learning of the rules. This video tutorial will show you all of the basics you will need to know as a beginner player. Once you watch this tutorial you will be up and running and ready to start a game of your very own. So, have fun!!

How To: Put your MS Access databases on your website

To start off the process of publishing your access database online we first look at a sample MS ACCESS database with typical formats and a online searchable application where users can search by library name or city and get details of the library. There are 3 steps to publish the database. The first step is importing data which can be done through clicking on the file menu and then click on import data through a Microsoft Access Database. Now select the file you want to import through the bro...

How To: Do a front flip

In this video, one of the gentlemen from the London stunt team 3Run shows us how to do a front flip. This is a very impressive trick that sends the performer spinning forward over the ground. Common sense would lead you to think that this trick requires a lot of strong, fast movements, but as the performer demonstrates, it's all about a light, delicate touch.

How To: Make slime for kids

Any time is the right time for slime! In this video tutorial, you'll learn how to whip up a nauseating glop of green goo. It's actually a remarkably simple process, requiring just a few basic steps and materials you probably already have around the house. So get to work, and then get sliming!

How To: Do the Asher Twist card trick

If you've ever seen the card trick Asher Twist, you've probably wondered how it was done. Well this magician will show you just how to do it, so maybe you can start doing it yourself! This trick requires excellent slight of hand to create a simple yet effective illusion. Check it out!

How To: Perform the "flipback cut" flourish card trick

If you know how to do a few card tricks, maybe it's time you learn a bit more. Work on your XCM (extreme card manipulation), watch this video tutorial to learn how to perform the "flipback cut" flourish card trick. Some basic skills required to perform this aerial flipback cut are the flip back and the 360 close. Remember, to be a magician, you need to practice.

How To: Fold the JKF-178 jet paper plane

Learn how to fold the JKF-178 Jetplane. Materials required :- An A4 size paper of type 80gsm and a pair fo scissors. Its' another variations of my other paper planes models. Hope that it will be well received. Would appreciate frank comments and fair ratings from all. Enjoy. Thank you.

How To: Prank people at the grocery store

No one likes having their food messed with. That makes it all the more fun to do so right? This video will show you some fun pranks that you can pull to mess with the food of your friends and neighbors. They include making surprise disgusting layer dip and ordering unusual combinations of items at the grocery store, but are all freakin' hilarious and require relatively little setup or risk.

How To: Grasp the human physiology of the heart

Want to know what a septum is? An aorta? The bicuspid valve? These are all parts of the human heart, and in these educational tutorial videos, you'll learn all you need to know about the physiology of the human heart. Anatomy, biology, physiology... it's all science, so no matter what field you are studying, these will be very helpful for you in your further medical studies, or for just know-it-all knowledge.

How To: Make rigid molds with fast-cast urethane

This excellent detailed video demonstrates how to create rigid molds with a fast cast urethane. Ideal for smaller models/molds with a flat side, fast-cast urethanes are widely used for their ease of use, low cost, and quick de-mold times. However, their use requires careful application of release agents. This process can be used in automotive, mechanical, fine art and film special effects uses.

How To: Make a clear silicone rubber mold

This is an excellent video that covers creating a clear silicone rubber mold to deal with a complex parting line or irregular shape. When a project requires a complex parting line, it is often easier to pour the entire mold in one process with clear rubber, then cut your parting line. This process also saves at least a day in creating the mold. This process can be used in automotive, mechanical, fine art and film special effects uses.

How To: Make a light sensing robot

Mousey the junk bot is a light sensing robot made out of an old computer mouse. Bre Pettis of Make Magazine goes over how the pieces are installed and talks about some mistakes that he wishes he could have avoided. This project requires a drill, a dremel, and soldering skills.

How To: Pack a recovery kit for your 4x4 to ensure your safety while offroading

If you spend a lot of time alone or close to it in the wilderness, then hopefully you already know how important it is to bring a properly packed survival kit. This is true for offroading enthusiasts as well as pedestrian outdoorsman, but the kit requires some great specifically related to your being in a 4x4. This video will show you what you should pack in your 4x4 offroad recovery kit and explains why this stuff will keep you safe.

How To: Make a chiptunes-style lead synth track in Reason 4

This video will teach you how to make a chiptune-style lead synth track using Reason 4. Chiptunes are basically electronic music songs made out of 8-bit sounds, mostly from video games. The synth lead you will be making in this video is not, as such, a true chiptune, it's better because it doesn't cling dogmatically to outdated technology.