SciShow
Do Menstrual Cycles Really Sync Up?
Have you had your period at the same time as your friends or family members? Is this a physiological effect or coincidence? Join Hank Green as he provides some insight on this phenomenon!
Bozeman Science
Harmonics
In this video Paul Andersen explains how the wavelength of a standing wave is determined by the boundary length and frequency of the wave. The fundamental frequency has a wavelength double the boundary length. Harmonics are built on the...
TED Talks
Ananya Grover: A campaign for period positivity
Having your period is exhausting -- and for many people across the world, menstruation is even more challenging because of stigmas and difficulty getting basic hygiene supplies, says social activist Ananya Grover. In this uplifting,...
Bozeman Science
Periodicity
In this video Paul Andersen explains why atoms in the periodic table show trends in ionization energy, atomic radii, electronegativity and charge. All of these trends are explained through Coulomb's Law. A brief description of Dmitri...
Crash Course
Electric Current: Crash Course Physics
So, electric current works like a river... kinda... Instead of flowing based on elevation, electric current works a little differently. But it's a good metaphor. In this episode of Crash Course Physics, Shini talks to us about electric...
Bozeman Science
Position vs. Time Graph - Part 1
Mr. Andersen shows you how to interpret a position vs. time graph for an object with constant velocity. The slope of the line is used to find the velocity. A phet simulation is also included.
SciShow
Cement: A Really Hard Problem
Concrete sucks CO2 out of the atmosphere, but making it initially produces a lot of carbon dioxide as a byproduct. Fortunately, by rethinking the chemistry of cement altogether, we can actually use carbon dioxide to create our concrete...
TED-Ed
TED-Ed: How to use a semicolon - Emma Bryce
It may seem like the semicolon is struggling with an identity crisis. It looks like a comma crossed with a period. Maybe that's why we toss these punctuation marks around like grammatical confetti; we're confused about how to use them...
SciShow
The Oldest Crater from a Meteorite…Isn’t a Crater after All?
There's one crater that may be older than any that we know of. Except there's a snag, it might not actually be a crater at all.
Bozeman Science
Wave Period and Frequency
In this video Paul Andersen explains how the period is the time between wave and the frequency is the number of waves per second. Period is measured in seconds and frequency is measured in Hertz. Wave period and wave frequency are...
TED-Ed
TED-ED: How menstruation works - Emma Bryce
At this moment, three hundred million women across the planet are experiencing the same thing: a period. The monthly menstrual cycle that gives rise to the period is a reality that most women on Earth will go through in their lives. But...
SciShow
Hydras: Our Immortal, Tentacled Friends
While humans age and die (which is kind of a bummer), it looks like hydras will stay young and fertile forever. Why is this? And what can we learn from these tentacular microscopic organisms?
Bozeman Science
Wave Equation
In this video Paul Andersen explains how a sine or cosine wave can describe the position of the wave based on wavelength or wave period. A wave function can the position of a wave as a function or the amplitude and wavelength or the...
SciShow
5 Things We Still Get Wrong About Human Reproduction
You'd think we'd know everything there is to know about sexual reproduction. But as it turns out, there are still quite a few things we picked up that aren't exactly true, and we're here to correct that. Chapters NEW EGGS 1:47 MENSTRUAL...
TED-Ed
The time value of money - German Nande
We’ve all heard the phrase “Time is money.” But what do these two things actually have to do with one another? German Nande explains the math behind interest rates, revealing the equation that will allow you to calculate the future value...
Crash Course
How Do We Investigate Outbreaks? Epidemiology Crash Course Outbreak Science
At the heart of outbreaks are people! People are the ones who get sick, transmit diseases, and change the way they live in response to outbreaks. In outbreak science, we can better understand the relationship between people and disease...
SciShow
A Brief History of Life: Rise of the Humans
With the non-avian dinosaurs extinct, it was time for mammals to take over. Finally, in the tiniest sliver of the history of life, humans emerge.
PBS
That Time It Rained for Two Million Years
At the beginning of the Triassic Period, with the continents locked together from pole-to-pole in the supercontinent of Pangea, the world is hot, flat, and very, very dry. But then 234 million years ago, the climate suddenly changed for...
Bozeman Science
Energy, Work and Power
Mr. Andersen defines the terms energy, work and power. He also uses a simple example to calculate both work and power.
Bozeman Science
Angular Impulse
In this video Paul Andersen explains how the change in angular momentum is equal to the torque applied over a given time. A sample problem and inquiry activity are included.
Crash Course
The History of Life on Earth - Crash Course Ecology
With a solid understanding of biology on the small scale under our belts, it's time for the long view - for the next twelve weeks, we'll be learning how the living things that we've studied interact with and influence each other and...
Bozeman Science
Metallic Bonding
In this video Paul Andersen explains how metallic bonding structure creates the different properties of metals. The electron sea model explains how the positive nuclei are locked into a negative sea of delocalized electrons. This sharing...
PBS
From the Cambrian Explosion to the Great Dying
The first era of our current eon, the Paleozoic Era, is probably the most deceptively fascinating time in Earth's history. With near constant revolutions in life, punctuated by catastrophic extinctions, it is also one of the most chaotic.
PBS
The Age of Reptiles in Three Acts
Reptiles emerged from the Paleozoic as humble creatures, but in time, they grew to become some of the largest forms of life ever to stomp, swim, and soar across the planet. This Age of Reptiles was a spectacular prehistoric epic, and it...