Hank lets us in on the meaning of life, at least from a biological perspective - it's reproduction, which answers the essential question of all organisms: how do I make more of myself? So, sex, how does it work?

Paul Andersen starts with a brief description of asexual and sexual reproduction. He explains how meiosis ensures variation in the next generation. He describes the important structures in the male and female reproductive system. He...

In this video Paul Andersen explains the major phases of meiosis including: interphase, prophase I, metaphase I, anaphase I, telophase I, cytokinesis, interphase II, metaphase II, anaphase II, and telophase II. He explains how variation...

Gym teacher Hank gives us the full story of the past, present, and future of birth control.

Because of the way genetic reprogramming works, it’s hard to make one clone based on an adult cell, and it’s almost impossible to make a second-generation one.

Yapoks are cute aquatic marsupials, and they're the only living creatures that need pouches for their sacs.

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...

The process of human baby making seems pretty straightforward: egg+sperm+time=baby. But hold on to your ovaries, folks! It’s pretty rare, but sometimes, days or weeks after a person gets pregnant, they can get pregnant again in a process...

Infertility affects 1 in 8 couples worldwide. But in the last 40 years, more than 5 million babies have been born using in vitro fertilization (IVF). How does it work? Nassim Assefi and Brian A. Levine detail the science behind making a...

It's Taco Tuesday and you're chopping up some tasty bell peppers for that nice sweet crunch. But what's this? A pepper inside your pepper? Is nature playing a prank on you or is there more to it?

You probably have a vague idea of what sperm does, but not all sperm are created equal, and some have even developed unique adaptations to get where they're going.

Hank discusses the process by which organisms grow and develop, maintaining that, in the end, we're all just tubes.

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...

Human reproduction is complicated an important, and it's going to take a four part series for us to cover it. Today, we're kicking that off with the female reproductive system, starting with how sex hormones affect oogenesis and...

Hank and his brother John discuss heredity via the gross example of relative ear wax moistness.

Hank introduces us to nonvascular plants - liverworts, hornworts & mosses - which have bizarre features, kooky habits, and strange sex lives. Nonvascular plants inherited their reproductive cycle from algae, but have perfected it to the...

Paul Andersen explains how the cell cycle is used to create new cells. The creation of identical diploid daughter cells, through mitosis, is described. The creation of unique haploid daughter cells, through meiosis is also described. ...

Paul Andersen explains how the process of meiosis produces variable gametes. He starts with a brief discussion of haploid and diploid cells. He compares and contrasts spermatogenesis and oogenesis. He explains how each person is...

Everyone talks about condoms as a way to prevent pregnancy. They're good, but nowhere near perfect. The pill is even better. But want to know what's amazing? Intrauterine devices, or IUDs. Why don't women use IUDs? They were pretty rare...

Pregnancy can be a scary time for many reasons, one of which is having so many things feel off-limits for the safety of the fetus. But what about vaccines? Especially the Covid-19 vaccine? To understand the answer to this question you...

Are penises as big of a deal as we think they are? In this episode of Crash Course Sex Ed, we break down the history, myths, and assumptions we’ve made about penises, from the “right” size to circumcision, and from erections to blue balls.

Howcast - Learn about the possible side effects of a birth control sponge in this Howcast video.

Howcast - Learn what spermicide is in this Howcast video about birth control.

Howcast - Learn how safe and effective a diaphragm is in this Howcast video about birth control.