If you’re scratching your head during math class, wondering what you’ll ever use this stuff for, here’s a cool experiment that shows you how scientists use math to figure out the optical density of objects, called the “index of refraction”. …Read More
We’re going to make a quick and easy drawing machine that will teach your kids about the conservation of energy! By storing energy in the rubber band (called “elastic potential energy”), you can see for yourself how this transforms into …Read More
Ancient people teach us a thing or two about energy when they laid siege to an enemy town. Although we won’t do this today, we will explore some of the important physics concepts about energy that they have to teach …Read More
What keeps building from toppling over in the wind? Why are some earthquake-proof and others not? We’re going to look at how engineers design buildings and bridges while making our own. Can you build a bridge using only popsicle sticks …Read More
Most of the electricity you use comes from moving magnets around coils of wire. Electrical power plants either spin HUGE coils of wire around very powerful magnets or they spin very powerful magnets around HUGE coils of wire. The electricity …Read More
Burglar alarms not only protect your stuff, they put the intruder into a panic while they attempt to disarm the triggered noisemaker. This experiment teaches students how to make simple burglar alarms, which are really clever switches, out of their …Read More
You can’t just shine a flashlight through a lens and call it a laser, because the way a laser generates light is what makes it a laser in the first place. The word LASER is an acronym for Light Amplification …Read More
Light is energy, and it can be defined by four things: intensity (how bright), frequency (or wavelength), polarization (the direction of the electric field), and phase (time shift). We’re going to look at different ways to produce light as well …Read More
We are going to make an eyeball model using a balloon. This experiment should give you a better idea of how your eyes work. The way your brain actually sees things is still a mystery, but using the balloon we …Read More
The Sun rotates, but because it’s not a solid body but a big ball of gas, different parts of the Sun rotate at different speeds. The equator rotates once every 27 days, which is faster than the rotation at the …Read More
Telescopes and binoculars are pretty useless unless you know where to point them. I am going to show you some standard constellations and how to find them in the night sky, so you’ll never be lost again in the ocean …Read More
Rockets are vehicles that launch people and payloads into space. Newton’s Third Law of Motion is the principle of action and reaction. With rockets, the action is the force generated by the exhaust gases shooting out the back end of …Read More
Ever since I was a kid, I have always wanted to fly. In fact, at four years old you could find me on top of a ladder armed with a box fan (plugged in and turned on) and an umbrella, …Read More
This is a really neat game invented in 1967 by two mathematicians that was soon after published in Scientific American, where it caught fire with people all over the world. It’s a very simple game with a lot of interesting …Read More
Having trouble with your 6, 7, 8, and 9 multiplication tables? Sneak a peek at this nifty trick for multiplying single digits together. All you need is a set of hands and about ten minutes, and you’ll be a whiz …Read More
Cryptarithms are a puzzle where the digits are replaced by letters or symbols. When the numbers are replaced by letters of the alphabet and it spells something readable, it’s called Alphametics. Download the student worksheet that goes with this lesson. …Read More
One day, my kid asked me how a calculator comes up with its answers. That’s a great question, I thought. How does a calculator do math? After thinking about it, I realized this was a great way to teach him …Read More
Cryptography is the writing and decoding of secret messages, called ciphers. Now for governments these secret ciphers are a matter of national security. They hire special cryptanalysts who work on these ciphers using cryptanalysis. The secret is, solving substitution ciphers …Read More
Pi is a number (slightly greater than 3) that shows up when you divide the circumference of a circle by its diameter, no matter what size the circle is. It also shows up in other shapes like spheres, ellipses, cylinders, …Read More
When it’s too hard to count ’em up and too much time to calculate, it’s time to guesstimate the answer. I use this technique all the time to “ball park” my answer so I know if I’ve made a mistake …Read More
If you hate long division like I do, then this lesson will be very useful in showing you how to make the most out of your division tasks without losing sleep over it. It’s easy, quick, and a whole lot …Read More
If you don’t have the patience to do multiplication on paper for every single math problem that comes your way, then you’ll really enjoy this math lesson! You’ll be able to multiply one and two digit numbers in your head, …Read More
In school, you are trained to solve math problems on paper, at a desk. The problem with that is, for most people, math problems don’t usually come with a desk or a pencil. They pop up in the checkout line …Read More
If you haven’t memorized your multiplication table yet, I am going to show you how to you need to memorize only three of the 400 numbers on a 20 times table in order to know your table. Download the student …Read More
Launching rockets requires a lot complicated math, but it all starts with Newton’s Laws of Motion. We’re going to get a taste of the math behind the real rocket science. Using math with rocket science experiments allow scientists to figure …Read More
Here’s our first MATH lesson. It is so easy that one night, I wound up showing it to everyone in the pizza restaurant. Well, everyone who would listen, anyway. We were scribbling down the answers right on the pizza boxes …Read More