Some types of bacterial infections are notoriously tough to treat — and it's not all due to antibiotic resistance. The bacteria themselves are rugged and hard to penetrate with drugs.

MyFitnessPal adjusts your calorie goal for the day according to your activity level. The more active you tell the app you are, the more calories it tells you to consume — simple, right? Unfortunately, MFP doesn't tell you to consume fewer calories when you don't work out. However, an activity tracker like a FitBit or Apple Watch can help.

Need a little help with your math homework? No problem, the Math Centre offers students video tutorials that will provide as a reference guide for self-study. Students get self-study resources targeted to the needs of individual courses, and teachers gain generic mathematics support and study materials for use with students.

C For Chemistry delves into the chemistry of science experiments. This chemist knows what he's talking about. These chemistry experiments are not only fun, but very educational for all of those interested in scientific chemical reactions and properties.

Want to simplify a rational expression with a negative exponent? It's easy once you know how. Learn how it's done with this free video algebra lesson. From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just study for that next big test).

Need to know how to multiply and divide negative numbers in basic math? From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just finish your homework or study for that next big test). With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to multiply and ...

Looking for a guide on how to work with negative exponents in basic math? From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just finish your homework or study for that next big test). With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to solve simpl...

Looking for a guide on how to sum and subtract negative integers? From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just finish your homework or study for that next big test). With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn how to add and subtract ne...

Taking the negative of an image in photography brings out its major contours and creates a powerful graphic contrast between white and black. The same sort of effect happens when you construct a card using only the "negatives" and no other colors.

Love Microsoft Excel? This clip contains a tip that just might induce you to. With this free video tutorial from ExcelIsFun, the 4nd installment of his "YouTubers Love Excel 2007" or YTLE2k7 series of free video MS Excel lessons, you'll learn how to use conditional formatting to add red to negative numbers and green to positive numbers using a single True/False formula!

Lawrence Perez, from Saddleback College, and his assistant Charlie, give this pre-algebra lesson on adding negative numbers together. You'll learn the easiest way to do it, and maybe even freshen up on your subtracting skills. Don't waste your time in summer school, learn it here.

Lawrence Perez, from Saddleback College, and his assistant Charlie, give this pre-algebra lesson on subtracting negative numbers. Don't get confused with those minus symbols. Learn how to manage them correctly, and with ease.

In this episode learn to ask negative questions with "don't" followed by a verb and "to be" in the English language. This video is great for advanced, intermediate, and beginner learning to speak the English as a second language (ESL).

Tapping can help to free you from persistent or inappropriate negative emotions. Sometimes these emotions make sense. If someone close to you dies, or a relationship ends, you're going to feel sad. But sometimes we feel depressed for no good reason, or very angry with someone who hasn't really done anything to deserve it. You're the only judge of whether or not an emotion is appropriate or inappropriate.

Remember the old days when we used to use film negatives? You'd use them to create slides or even prints from the local photo lab. CNET shows you how to updates all your old photo prints, slides and negatives into digital copies on your computer using a multifunction printer, which most nowadays have slide and negative scanners built right in.

In this Math Made Easy tutorial the author shows how to subtract positive and negative numbers. He says that because of the numerous combination of positive and negative numbers it adds to a lot of confusion. Now he shows a trick of how to add positive numbers to negative numbers showing that it's equivalent to subtracting the negative number from the positive number. He shows that if you want to subtract a negative number from a positive number we should actually cancel all the signs and the...

This video walks you through the steps of applying zero, negative, and fractional exponents. This excellent video shows you a clean blackboard, with the instructors voice showing exactly what to do. Don't fret, any question you may have, will be answered. Watching this video will make you feel like your back in the classroom but rather comfortably from your home.

This explanation of positive and negative signs in addition is beneficial and easy to understand for young school aged children. The tutor of this video explains briefly about what to do with the different signs on both side of addition problem. The number line helps the viewer of this video to visually understand the concepts discussed. The tutor explains the direction of number line evaluation is dependent on the left side operand, which is also used to understand the concept of a number line.

How to subtract positive and negative integers: There are four types of subtraction:

Multiplying positive and negative numbers may seem confusing. However, in this math tutorial, multiplying numbers with different or same signs is made easy and eliminates all confusion. The narrator of the video explains the key rules to remember when dealing with the possible combination of positive and negative numbers. The video breaks it down to two key rules. When you have a negative and a positive number; the result will always be negative. When you are given two numbers that have the s...

This video explains the process of simplifying an algebraic expression with negative exponents. The video starts with an example of such an algebraic expression; the expression contains negative powers in both the numerator and denominator. The location of the negative exponents is first pointed out visually. Next, it is observed that there are like based or variables in both the numerator and denominator; however, it is explained that the numerator must first be expanded before the expressio...

This shows the process of making a positive image on clear glass; traditionally, this would be called an Ambrotype. Here, it is a little bit overexposed to get a "soft negative" or a negative that can be used with modern silver paper (printing). Learn how to make a glass positive or soft negative picture with the Collodion printing technique by watching this video photography tutorial.

Not all inequalities are created equal. See how to solve three of the most common types with this free video algebra lesson, which discusses regular, negative and mixed-variable inequalities. From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just finish your homework or study for that next big test).

In this video the instructor shows how to factor a trinomial with negative leading coefficient. Most of the students are confused when they have to factor a trinomial with a negative leading coefficient. But there are many ways to solve these kind of problems as shown in this video. One way you can do is that take out the greatest common factor (GCF) of -1 from the equation. So pulling the -1 gives you the original trinomial with all the signs of the terms changed. Now go on and factor the ne...

Need to learn how to divide positive and negative numbers? This instructional video will teach you the step by step process that will make you comprehend how to divide positive and negative integers. Just watch and follow along and you will soon be a wiz at tackling these kind of math equations. The simple steps will leave no question and you will be able to do any problem concerning the division of positive and negative integers and you will be better at math.

Trying to increase your Japanese vocabulary? This video language lesson shows simple verbs in the negative form written in Japanese as well as English while the word is clearly pronounced. Follow along while watching this video Japanese language tutorial and learn how to read and say some basic verbs in the negative form.

In this video, we learn how to understand negative exponents. The one rule you have to remember is when you have a number with a negative power, then you need to divide it over one. You can take this term and put it in the denominator of your fraction to make it a positive exponent. For example, if you have 5 to the -1, then you can move the 5 to the denominator and get 1/5, which is the same exact thing! This is one of the most basic rules in math. Once you understand this, simplifying fract...

This video shows the method to factor a trinomial with a negative sign in the front. The first step is to make the first term positive. This is done by taking the negative sign out. Then we see the middle term of the trinomial. The coefficient of the middle term is a positive one in the example shown. We have to group the coefficient of the first and third term in a way so that the difference is positive one. The appropriate combination is chosen so that this becomes true. In this way the tri...

Need a new perspective on giving feedback in the workplace? Giving feedback can be tough, especially when you're dealing with negative feedback. It's a challenge. This video will cover some quick tips you can use to make sure both parties get the most out of the experience. It will create a better work environment, and workers will be more willing to change their ways.

This video explains how to find the sign of slope of a line. The way shown means that you can find whether it is positive or negative without knowing its equation. It uses a simple analogy so that anyone would be able to use this method, even without much math knowledge. Being able to find the slope of a line is very important, as it leads to advanced function and calculus.

This is a video demonstration of making a wet plate collodion negative, or ambrotype. Learn how to make a print a Collodion picture by watching this video photography tutorial.

In this Diet & Health video tutorial you will learn how to conquer anger and negative emotions. The preacher in this video is Sadhguru Jaggi Vasudev. The guru starts off with a question; why do you want to conquer something that has no value for you or that you don't want? So, drop the idea of conquering anger. Right now you are not angry, anger doesn't exist. When something doesn't exist, how do you conquer it? You get angry when your energies do not behave the way you want them to. Being an...

In this tutorial, we learn how to scan and edit negatives with SilverFast and Photoshop. First, open up the software and lay your negative in the scanner. Make sure you have selected the correct settings when you go to scan it, and click that it's transparent. Also, you will need to increase the size of it and make sure the lighting is correct. Now, scan the image and load it onto the software. Once it's loaded, you will be able edit it by zooming in and then rotating the image so it's the co...

This video is for those people who have been doing a lot of exercise for months and not getting stronger and bigger and not developing muscles. The techniques that are being shown here are advised by the professionals and skilled trainers in this area. So the technique that can be used is forced negatives. It is called so because in this technique we are trying to lift more weight than what we can possibly lift normally. About ten percent more. It is done by using out other hand to give an ad...

The video begins with a piece of paper with questions 6 and 7 on from section 1.3. The narrator introduces these two questions as both having to do with graphing on a number line. Starting with question 6, which asks the person to graph -11/4 on a number line, the narrator draws a number line with the numbers up to -5 on the left, up to +5 on the right of 0 in the middle. She starts by showing -3 as an example, and then draws a black dot on the line at the point of the number 3. She then illu...

Watch this video sequence and learn to use the negative form of adjectives to describe things in Japanese.

Watch this video to review the affirmative past tense and to learn how to conjugate Japanese verbs in the negative past tense.

Learn how to make the verb "to be" negative in English.

The Manly Blades and Skater HQ trick tip of the week. Watch this video and learn how to build up to a negative mistrial trick on your rollerblades.

Want to add cool effects to your photos without using expensive equipment? Photographer Laina Briedis created these gorgeous shots by stacking 35mm negatives of starry or cloudy skies on top of photos of people to give them a surreal, dreamlike effect. There are a few ways to go about it. Laina explained to PetaPixel that you can do this with or without a darkroom. If you have access to one, you can expose two negatives at the same time by stacking them, or expose them separately onto the sam...