This week in news: Scientist successfully breed mice using same-sex parents and some very clever genetic engineering.

Hank briefs us on the news that a team of biologists has developed the first contraceptive for males that is totally effective, easily reversible and doesn't mess with your hormones!

Earlier this week, a team of researchers announced that they’d made a discovery about how we inherit mitochondrial DNA from our parents that could change what we know about not only disease inheritance, but human history as a whole.

We tend to think of fossils as dinosaur bones or petrified wood, but what if we told you that there's a lot we can learn from fossilized waste?

An idea permeates our modern view of relationships: that men and women have always paired off in sexually exclusive relationships. But before the dawn of agriculture, humans may actually have been quite promiscuous. Author Christopher...

Hank and Phil Plait dive deep into questions about gametes and sea mammals in this episode of SciShow Quiz Show!

Another aging rock star, another baby, does age have any affect on sperm, or are these little swimmers seemingly viable until death?

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...

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...

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.

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 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.

Paul Andersen answers the following question: How do organisms grow and develop?

Welcome back to SciShow Quiz Show, where Hank goes head-to-head with Craig Benzine, better known as WheezyWaiter.

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...

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...

Most other mammals have penis bones, so why don't we?

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...

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!

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...

One of Earth's biggest cells is one you're probably really familiar with.

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...

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...

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?