Hot Education How-Tos
How To: The Best Investigatory Projects in Science: 16 Fun & Easy Ideas to Kickstart Your Project
Most of us have conducted an investigatory science project without even knowing it, or at least without knowing that's what it was called. Most science experiments performed, from elementary to high school students and all the way up to professional scientists, are investigatory projects.
How To: Make This Amazing 9-Layer Density Tower from Things Found in Your Kitchen
Ralph Waldo Emerson once observed that "the seed of science" was "wonder," and taking a look at this nine-layer liquid tower from Steve Spangler's Sick Science! channel, one can't help but do just that — wonder. How is this possible? Is this magic or what?
How To: Simplify a quadratic formula result
In this video the tutor shows how to simplify a quadratic formula result. You can solve a quadratic equation using the quadratic formula. The first thing you have to do when given the quadratic equation is bring all the terms to one side so that you have a zero on the other side of the equals to sign. Now the formula to calculate the roots of the quadratic equation ax*x + bx + c = 0 is x = (-b + root of(b*b - 4*a*c) ) / 2 * a. The other root can be obtained by using the minus sign before the ...
How To: Make hydrochloric acid from salt
In this tutorial, we learn how to make hydrochloric acid from salt. First, you will pour some salt into a distil flask. After this, you will add in some concentrated sulfuric acid to the salt. Next, you will let these react with each other. You will start to see gasses bubble up and the excess hydrogen chloride gas come out through the top of the tube. To create a stronger reaction, you can add heat underneath the reaction. Then, test this by exposing it to ammonium chloride. If it's the righ...
How To: Find the circumference of a circle
Use a simple mathematical formula to find the circumference of a circle. The circumference of a circle can be determined by using the formula 2 times pi times the circle's radius. Pi is equal to 3.14. If a circle's radius is 10 centimeters, first multiply pi times 2. Pi, or 3.14, times 2 is 6.28. The next step then is to multiply 6.28 times the circle's radius. Since the circle's radius is 10 centimeters, multiply it by 6.28. This gives you 60.28. 60.28 inches, then, is the circumference of t...
How To: Make a Paper Plate Speaker That Actually Works for Under $1
Back in 2007, YouTube user HouseholdHacker posted a parody video on how to make a high-def speaker for under a buck. MythBusters took on the challenge and busted it.
How To: Use ">" (greater than) and "<" (less than) symbols
In this video the author explains how to identify the less than (<) and greater than (>) symbols and when to use them. She explains to us to relate the numbers to animals stating that the smaller numbers are smaller animals and bigger numbers are bigger animals. Now she tells us to imagine that smaller animals are eaten up by the larger animals. So she shows a smaller number comes on the left side of '<' sign and bigger number comes on the right side of '<' sign stating that the bigger number...
Classic Chemistry: Colorize Colorless Liquids with "Black" Magic, AKA the Iodine Clock Reaction
Want to make boring old colorless water brighten up on command? Well, you can control the color of water with this little magic trick. Actually, it's not really magic, but a classic science experiment known commonly as the iodine clock reaction, which uses the reactions between water and chemicals to instantly colorize water, seemingly by command. You can use different colorless chemicals to produce different colors, and you can even make the color vanish to make the water clear again.
How To: Make a Crazy Foam Explosion Science Experiment
Check out this video to see our Fantastic Foamy Fountain in action. The experiment uses Hydrogen peroxide and dry yeast. Hydrogen peroxide is similar to water but has an extra oxygen atom. This makes it more dangerous, and only adults should handle the hydrogen peroxide.
How To: Calculate Faster Than a Calculator
When you need to crunch numbers quickly — and I mean really quickly — there's a cool method you can use to multiply two numbers together in just a few seconds.
How To: Make elemental sulfur (sulphur)
This video tutorial is in the Education category which will show you how to make elemental sulfur (sulphur). The chemicals you need are nitric acid and sodium thiosulphate. The reaction produces toxic SO2 gas so keep it coved with a watch glass. Put 12.9 grams of sodium thiosulphate in a beaker and dissolve it in minimum amount of water. Pour about 15ml of nitric acid in to the beaker. Let it sit in a warm place for a couple of hours and the sulphur will settle at the bottom of the beaker. Th...
How To: Find a slope of a straight line with: Ax + By + C = 0
In this video the instructor shows how to find the slope of an equation which is in the form Ax + By + C = 0. He says that the formula to find the slope of a line in the above form is slope m = -A/B, where A and B are the numeric constants of the variables x and y in the given equation. He goes on and further shows how to do this with a couple of examples. He shows how to reduce any equation into the general form and how to apply the slope formula then. This video shows how to find the slope ...
How To: Calculate electrical power
This video introduces the formulae for watts in an electric circuit, P=IxE, P=I^R, and P=E^/R. It also explains how P=I^R and P=E^/R are algebraically derived from P=IxE and Ohm's Law.
How To: Extract DNA from a Strawberry with Basic Kitchen Items
We all know that DNA is pretty amazing, but it's not something that most of us get much hands-on experience with. Even though it's in every living thing around us, we never see it, so we rarely think about it either.
How To: Make iodine easily
In this video, we learn how to make iodine easily. You will need potassium iodine and sulfuric acid to make this. First, add the acid into the potassium iodine slowly. After you add in each part, swirl the beaker slowly so it gets mixed together. After you have added in all of the potassium, you will place this into a beaker filled with ice water while you add in more, because the mixture gets really hot. When finished, you will end up with a mixture that is iodine and nothing else. Fill with...
How To: Prove that water molecules are polar with a home-science experiment
This free video science lesson from Jefferson Lab demonstrates a simple technique for demonstrating the polarity of the water molecules. For all of the relevant details and detailed, step-by-step instructions, as well as to get started trying this experiment yourself, watch this home-science how-to.
How To: Find the slope of a line given 2 points with fractions
In this video tutorial the instructor shows how to find the slope of a line given two points with fractional values. To do this first name your two points as point 1 with coordinates as x1, y1 and point 2 with coordinates x2, y2. Then substitute the values in the equation of the slope which is slope m = (y2 - y1) / (x2 - x1). Now all you have to do is simply the fraction after substituting the point values. Be careful about the signs while substituting in the formula. Now finally after solvin...
How To: Make Your Own Homemade Glow Sticks
Glow sticks, a popular favor at parties and outdoor events, and a must-have on Halloween, can be traced back to the United States Navy in the mid-1960s. The military desired improved visibility during night operations, and glow sticks, with their small-size portability and lack of batteries, were a perfect tactical solution.
How To: DIY Ninja Turtle Ooze! Make Your Own Radioactive Canister of Glowing Green Slime at Home
There's a broken canister of mutant ooze leaking down into the sewers! But don't worry because this sticky slime is non-toxic, and it's so easy to make, a three-year-old can do it!
How To: Solve equations with the order of operations
In mathematics, the order of operations define the priority in which complex equations are solved. The top priority is your parenthesis, then exponents, followed by multiplication and division, and finally addition and subtraction (PEMDAS). This video tutorial demonstrates the order of operation with various examples and explains the associated methodology. From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autod...
How To: Find a number given Its percent
This how-to video is about how to find a number when its percent is given. This video is really helpful and effective in finding the number when the percent is given, the following steps are explained in the video to find the number when its percent is given:
How To: Make aluminum nitrate nonahydrate
Aluminum nitrate nonahydrate is a crystalline hydrate - a salt of aluminum and nitric acid - Al(NO3)3·9H2O. It's used for a variety of things such as antiperspirants, corrosion inhibitors, and petroleum refining, or… glow-in-the-dark powder. Watch this science video tutorial from Nurd Rage on how to make aluminum nitrate nonahydrate with Dr. Lithium.
How To: Make nitric acid
Watch this science video tutorial from Nurd Rage on how to make nitric acid. They show three ways to make nitric acid based on two different chemical approaches, both of which can be done using easily accessible materials.
How To: Dissect a frog and look at its anatomy
This video tutorial will show you the steps on how to dissect a frog. First, you'll have to get a frog, then you'll have to make sure it's dead, then perhaps wash it off. Then just take a look at the external anatomy of the amphibian before slicing it open. To slice, you'll need dissection forceps or tweezers and the dissection scissors. From then on, you'll be knee deep in frog anatomy. Tons of internal organs for you to learn from. So, watch this science video for learning about the anatomy...
How To: Turn a Glass Bottle into an Electric Tornado Machine
We've all seen the classic tornado-in-a-bottle science experiment, which uses 2 two-liter bottles to create a whirlpool effect. This version requires you to get the tornado started yourself by spinning the bottles, but what if you want to make it fully automated?
How To: Turn Just Half of a Purple Liquid Clear with the Photochemical "Two-Faced" Reaction
We've shown you how to make water change color on command, but how about just half of it? What if I told you that you can split a solution right down the middle and make the color disappear from one side, just by shining light on it?
How To: Launch a Camera into Space (On a Shoestring Budget)
Earlier this month, Adam Cudworth, 19, launched a camera attached to a weather balloon into the edge of space. Battling tough winds, freezing temperatures, atmospheric pressure and tumbling speeds, the teenager from Worcestershire, England was able to capture these amazing pictures of the Earth's upper stratosphere. How to Send a Camera into Space
How To: How Do You Balance 14 Nails on a Single Nailhead? Find Out with This DIY Gravity Puzzle
This little brain game is all about engineering a lower center of gravity. The idea has been around forever, but most people still don't know how to do it. Trying to stack nails above the balance point will raise the CG and make the structure unstable. Here's how you can lower the CG to make a very stable structure and impress your friends.
How To: Observe the Full Moons in 2011 (Lunar Calendar)
When's the next full moon? Every time I've looked at the moon, I've wondered if it was full. Sometimes it looked like it was, but it's really hard to tell for sure unless you know the exact date of the full moon. Seriously, there's at a couple days before and after the full moon that could easily pass as full. At least, to someone like me who isn't naturally in tune with the moon's cycle (and doesn't have perfect vision).
How To: Make a battery at home out of table salt and aluminum
For this tutorial, you will need some water, table salt, a few square feet of aluminum foil, a needle, some steel wool, a pair of wired alligator clips, a thick paper towel and a voltmeter to test out your new battery.
How To: Multiple and divide rational expressions
This video walks you through the steps of multiply and divide rational expressions. This excellent video shows you a clean board, 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.
How To: Simplify radical expressions
In this video the instructor shows who to simplify radicals. If you have a term inside a square root the first thing you need to do is try to factorize it. First factorize the numerical term. Write down the numerical terms as a product of any perfect squares. Now split the original radical expression in the form of individual terms of different variables. Now you can pull out the perfect square numerical factors out of the radical. Similarly for the variable terms write the variables as power...
How To: Do long division without a calculator
This video shows you step by step how to do long division without the use of a calculator. The video shows viewers two different ways to solve a division problem. It first shows how to do the problem the traditional way, then it shows how to do it according to the long division process. The long division process is where you write the whole division, multiplication, and subtraction process out showing all your work. Long division is mainly used when dividing large numbers. There are three com...
How To: Find the equation of a perpendicular line
In this video the instructor shows how to find out an equation of a perpendicular line. If you need to find the equation of a line passing through the given point and perpendicular to another line, the first thing you need to do is compute the slope of the given line. Obtain the slope of the equation by writing it in the form of y = mx + b. Now the product of slopes of two perpendicular lines is negative one. So the slope of our required line will be negative inverse of the slope of given lin...
How To: Figure out and calculate sales tax
Video describing about how to calculate a sales tax price based on purchase price and sales tax percentage. There is one example which is described as below:
How To: Use the Unicam UV-visible spectrometer in the lab
The Department of Biological Sciences at the University of Alberta brings you this video tutorial specifically relevant to your student laboratory courses, specifically microbiology. If you're a student at any school of biology, this information will be helpful for learning how to use the Unicam UV-visible spectrometer, split beam and internal printer in the lab.
How To: Dissolve styrofoam with acetone
Dissolve styrofoam with acetone using tips from this how-to video. Acetone breaks the structure of polystyrene in its expanded form, styrofoam. The 'foam' bit goes away. In other words, acetone "dissolves" polystyrene.
How To: Make a ball of plasma in a microwave
There are about fifteen states of matter: solid, liquid, gas, plasma, et cetera. Plasma is commonly found in stars, and is a rare natural phenomenon here on Earth. In this video, I show you how to make artificial plasma in your microwave.
How To: Determine the empirical and molecular formulas for a compound in chemistry
In this free video science lesson from Internet pedagogical superstar Salman Khan, you'll learn how to determine the empircal and molecular formulas of a substance given percent composition. Whether you need help studying for that next big test or could just use a hand finishing your homework, you're sure to be well served by this video lesson. For more information, including detailed, step-by-step instructions, take a look.
How To: Multiply & Divide Numbers (Basic Elementary Math)
Adding and subtracting may be the easiest of mathematical operations, but once you get it down, multiplication and division can be just as easy. That's why it's called elementary arithmetic. If it were harder, it would be called college algebra or trigonometry. But it's not— it's basic math, and once you get your head around the numbers, you'll never hate math class again! (Okay, maybe you will.)
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