How To: Understand depth of field while focusing a camcorder

Depth of Field (DoF) is easy to understand, but it is often extremely poorly explained. It's all about selective focus. For consumers with conveniently small camcorders, you only have two options: get your subject away from the background and then (1) zoom in or (2) get the subject close to the camera. No 35mm lens adapters, no secret techniques, no complex math: That's it!

How To: Understand polyatomic chemical formulas

This is a video tutorial in the Education category where you are going to learn how to understand polyatomic chemical formulas. When writing the formula using polyatomics, the same cross-over rule applies. 1st identify the metal and non-metal. Then you write the symbols, write the charges, cross-over the charges from top to bottom, remove the charge and simplify the numbers and remove the 1s. for example, iron (II) phospahate. The "ate" ending implies that phosphate is polyatomic. The symbol ...

How To: Understand Virtual DJ basics

Virtual DJ is an epic piece of software that allows you to become a disc jockey, without even having to get up from your chair. In this video tutorial, learn how to use the basic functionality of this great application. Download a free trial of Virtual DJ and start mixing.

How To: Understand how Google treats links from Facebook and Twitter

Google is the biggest and best search engine on Earth, and if you are a webmaster and want your website to be a big success it would really behoove you to know as much about how it works as possible. The Google Webmasters series of videos and website were created to teach webmasters, SEO professionals, and others how Google works by answering their questions and giving them insights into how they can best integrate and utilize Google's functionality to improve their business. This video expla...

How To: Make Sure People Will Understand Your Writing by Testing Your Readability Score

There is a substantial number of helpful tools at your disposal in Microsoft Word when it comes to writing; grammar check, word count, dictionary, thesaurus, and tons more. One tool that doesn't necessarily make itself obvious is testing your document's readability. With this built-in tool, you can not only check your spelling and grammar, but also the reading level of your document.

How To: Understanding Signature Schemes: How Data Sources Are Authenticated, Secured, & Spoofed

One of the biggest problems in data security is authentication of data and its source. How can Alice be certain that the executable in her inbox is from the venerable Bob, and not from the not-so-venerable Oscar? Clearly Alice wants to know because if this file is actually sent to her by Oscar, the file might not be a game, but a trojan that can do anything on her computer such as sift through her email and passwords, upload her honeymoon pictures, or even turn on microphones and webcams. Thi...

How To: Understand and handle duplicate content and multiple site issues with Google

Google is the biggest and best search engine on Earth, and if you are a webmaster and want your website to be a big success it would really behoove you to know as much about how it works as possible. The Google Webmasters series of videos and website were created to teach webmasters, SEO professionals, and others how Google works by answering their questions and giving them insights into how they can best integrate and utilize Google's functionality to improve their business. This video will ...

How To: Pick a padlock and understand how it works

When picking a padlock, the only part you need to worry about is the part where the key goes into the lock. The locking mechanism has pins attached to springs. The key pins are on the bottom and the driver pins are on the top. The key turns when the pins of different heights are separated, flush and aligned. Stick a tension wrench into the keyway and put pressure on it. Take a pick to push the rest of the pins up until they are flush with the shear line. Stick the tension wrench into the bott...

How To: Understand the inner workings of an RC car engine

Are you a radio control car enthusiast who's never moved beyond the store-bought toy models from Radio Shack? Then this nine-part series of videos is what you've been waiting for. It breaks down how RC engines work in exhaustive detail, including whole sections on carbs, pipe tuning, fuel mixing, and super chargers, among other topics. You may not be able to put your own RC car together entirely from scratch after this, but you will have a broad, deep understanding of how their engines work a...

How To: Understand the basics of food safety in cooking

"Foodborne illnesses are responsible for more than 75 million illnesses, more than 230,000 hospitalizations, and approximately 5000 deaths each year in the United States." In this six-part video lesson, learn about the basics of food safety in a commercial food enviornment. In the first video, three types of contamination are gone over as well as how improper handling can allow food to become dangerous to your patrons. In video two, learn about proper holding times and temperatures, and what ...

How To: Understand the Big Bang theory

Curious about the Big Bang Theory. In this four-part video, learn all you need to know from a great source. Hosted by Professor Richard Muller of the University California, Berkeley, this lecture is part of university's spring 2006 webcasts of "Physics For Future Presidents".

How To: Understand the physics of waves: true story of Roswell

In this three-part video, learn about the events surrounding the newspaper article in Roswell New Mexico 1947 regarding crashed flying saucers. The story has to do with nuclear weapons, the second world war, government lies and the movement of sound waves. See how the evnst of Roswell tie in with physics of waves with help from host, Professor Richard Muller of Berkeley University.

How To: Understand reduction & oxidation in Chemistry

Curious about reduction & oxidation? In this two-part episode of The Science Catalyst hosted by Barry Lambson, the subject of Chemistry, reduction & oxidation is gone over with iron powder and copper sulphate. Oxidation and reduction are heavily related which is why they are both considered "redox reactions". Acids and bases may be thought of as reactions involving hydrogen, or protons, while redox reactions tend to be concerned with electron gain and loss.

How To: Say "I don't understand" in perfect French

In this free video language lesson, you'll learn how to say the French words for "I don't understand": "Je ne comprends pas." While French isn't necessarily a very difficult language for an English-speaker to learn, many stumble when it comes to pronunciation. Fortunately, the Internet is awash in clips like this one, which make learning both vocabulary and proper pronunciation a very easy task.

How To: Understand binary numbers in 60 seconds

Understand how binary numbers work, including how to read binary numbers, and create your own. This mathematics or computer programming tutorial is a zip to get through. It covers practical and theoretical use and need for binary code understanding. Binary means zeroes and ones in a series. This is paramount to digital transmission versus analog that transmits in a sinusodial wave form.

How To: Understand crescendo, diminuendo & other tempo changes on the piano

In this video, we learn how to understand crescendo, diminuendo & other tempo changes. When you are playing piano, you are supposed to play the note until a dynamic change is shown on the music. A sforzando means that you must suddenly play very loudly. This occurs most in a surprise symphony. A crescendo is when you change the volume gradually. As the lines grow on the symbol you will increase the volume or decrease it if it's from larger to smaller. When you play dimiuendo you must not slow...

How To: Understand the anatomy of the upper back for drawing

In this video, we learn how to understand the anatomy of the upper back for drawing. First, you will need to learn how to draw the skeletal block of the body. Once you have drawn the outline for the skeleton, you can continue onto the rest. Make sure to add in the details for all the parts of the body, using thin lines at first, then thicker lines. Color these in white once you have the bone shapes made, then color in the "meat" on top of those. Draw in lines to create shading and realism on ...

How To: Understand the sequence of tenses for English

This video tutorial in the Language category will show you how to understand the sequence of tenses for English. This is useful when you want to change direct speech to indirect speech and also for understanding conditional sentences. When the sentence is originally in the present tense, it can be changed to past tense. For example Paul said, "I am hungry". You can change this to indirect speech either in the present tense or in the past tense. So, the sentence can be said as Paul says he is ...

How To: Say "I don't understand" in Spanish ("No entiendo")

In this free video spanish lesson, you'll learn how to say and properly pronounce the Spanish words for "I don't understand": "No entiendo." Interested in learning Spanish but haven't got the time to take a weekly language class? No problemo! The Internet is awash in free, high-quality video lessons like this one. For more information, and to get started using this phrase yourself, watch this helpful video guide for Spanish students.

How To: Understand organic molecules & elimination reaction

This video helps us understand the organic molecules and elimination reaction. Take some sugar in a beaker. Sugar has 12 carbon atoms, 22 hydrogen atoms and 11 atoms of oxygen. The sulphuric acid is poured into the sugar and the color change is observed. The color of the sugar gradually changes into black. The sulphuric acid causes an exothermic reaction which releases a large amount of sulphur dioxide gas. All the water (containing hydrogen and oxygen atoms) is eliminated out of the sugar du...

How To: Understand English phrasal verbs & compound words

The presenter, Ms. Jennifer explains how compound words are formed from phrasal verbs. With examples she explains how the meaning and pronunciation differs when compound words are formed from phrasal verbs. She explains the difference between 'show' and 'show off' by showing her collection of fans, and showing off with one of her beautiful fan from Japan. Then she explains the difference between 'show off' and 'show-off', giving examples and makes the listeners clear about compound nouns also...

How To: Understand aperture values in photography

If you're just getting started in photography or if you're looking to learn a little bit more about your camera, then you may have run into the term "Aperture" or "Aperture Values", or those weird number numbers. Aperture is in the lens of your camera and determines how much light enters into the lens itself and helps to determine your focal length. In this video you will get a small lesson on what Aperture is, and how to calculate focal length and aperture values.

How To: Take tribulus supplements & understand side effects

Tribulus is an herb that is found all over the world and is often thought of as a weed, however many take it as a testosterone booster, sexual enhancer or appetite suppressant. In this clip, Dr. Ray Sahelian will walk you through tribulus and make sure you are informed before you decide to take it. He will also detail all of the possible side effects and debunk any rumors associated with the herb.

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