SciShow
The Male Biological Clock
Another aging rock star, another baby, does age have any affect on sperm, or are these little swimmers seemingly viable until death?
SciShow
News Bummers Poison Fog Sad Sperm & SAM
Hank loves science because it helps us appreciate the world more, but not everything that science does makes him happy - reports of poison fog on the West coast of the United States; dramatic decreases in sperm counts; and a lack of...
TED-Ed
TED-ED: The evolution of animal genitalia - Menno Schilthuizen
Genitals are the fastest-evolving organs in the animal kingdom. But why is this so? And what's the point of having decorative private parts? Menno Schilthuizen explains how the evolutionary biology of nature's nether regions uncovers a...
SciShow
Why Is Sperm Count Dropping?
Sperm count in Western countries has been dropping for over a hundred years, and scientists have some ideas as to what’s behind this swimmer shortage.
TED-Ed
TED-Ed: Human sperm vs. the sperm whale - Aatish Bhatia
Traveling is extremely arduous for microscopic sperm -- think of a human trying to swim in a pool made ofother humans. We can compare the journey of a sperm to that of a sperm whale by calculating the Reynolds number, a prediction of how...
SciShow
Huge Sperm and Giant Tentacles: Relax, It's Marine Biology
SciShow shares the latest developments in science, this week including new insights into the evolution of giant sperm, and the discovery of a whole new order of animal.
Bozeman Science
LS1B - Growth and Development
Paul Andersen answers the following question: How do organisms grow and develop?
SciShow
SciShow Quiz Show: With WheezyWaiter!
Welcome back to SciShow Quiz Show, where Hank goes head-to-head with Craig Benzine, better known as WheezyWaiter.
Bozeman Science
Diploid vs. Haploid Cells
In this video Paul Andersen explains the difference between diploid and haploid cells. He starts with a brief description of the central dogma and how genes code for proteins. He then uses the phenotype of red hair to explain that humans...
Amoeba Sisters
Mitosis vs. Meiosis: Side by Side Comparison
After learning about mitosis and meiosis from our individual videos, explore the stages side by side in this split screen video by The Amoeba Sisters! Expand video details for table of contents. Vocabulary in this video includes...
SciShow
Why Did the Rooster Lose Its Penis?
Why did so many birds ditch penises? Maybe it was natural or sexual selection, an accident, or in exchange for something way more useful to them. Whatever the reason, penis loss goes to show that internal fertilization doesn’t require a...
SciShow
Is That a Cold or Are Your Organs Flipped?
If you’re someone who is constantly coughing up mucus, you might not actually have allergies. There’s a possibility that your organs are flipped and you don’t even know it!
SciShow
The Science Behind 'Genetically Modified Humans'
The media have been talking about “genetically modified humans” and “designer babies.” But what they’re really talking about is germ-line engineering: a process that could help eliminate heritable diseases. So why do some scientists want...
MinuteEarth
An Egg Is Just One Cell
One of Earth's biggest cells is one you're probably really familiar with.
Be Smart
Could We Clone Ourselves?
Is the science of Orphan Black realistic? Could we clone humans, or engineer them to have customized traits? We take a look at today's genetic engineering technologies to find out if designer babies and human cloning is, or should be, a...
Amoeba Sisters
Meiosis (Updated)
Updated meiosis video. Join the Amoeba Sisters as they explore the meiosis stages with vocabulary including chromosomes, centromeres, centrioles, spindle fibers, and crossing over. Major Points in Table of Contents: Intro 00:00 Mitosis...
SciShow
Fighter Pilots Seem to Have More Daughters — Why?
Some people think that being a fighter pilot and a parent means that you will have a household full of daughters - but does the data back that up?
SciShow
Nurseryfish Dads Give Their Young a Headstart… Literally
Happy Father's day! Today we're talking about the fintastic Nurseryfish, which is one of the best dads you can fish for.
Amoeba Sisters
Dihybrid and Two-Trait Crosses
This video will show how to set up and solve everyone's favorite 16 square Punnett square.
SciShow
Why Are Mules Sterile?
Horse plus donkey — it seems like an unlikely combination. I mean, they're different species! And yet, when they get together, they can produce a mule or the lesser-known hinny. Either way, those offspring usually can't become parents...
Crash Course
Reproductive System part 3 Sex & Fertilization Crash Course A&P 42
After weeks of discussion of human reproduction, today we arrive at the main event: THE SEX. Hank explains the four phases of the human sexual response, how a sperm finds and fertilizes an egg, creating a zygote, and how different types...
SciShow
Why Echidnas Are Evolutionary Misfits
It’s pretty well known that Australia is home to some strange animals, but echidnas are especially weird evolutionary misfits.
SciShow
Why Y Chromosomes Won’t Be Around Forever
We're generally taught that chromosomes determine an animal's sex, but it is way more nuanced than that.