Meiosis is the process of cell division that gives us gametes such as sperm and egg cells. This video covers how the process works, why gametes are so important, and explains chromosomes.

Contraceptives are methods people use to prevent pregnancy. In this video we explore the many hormonal and non-hormonal types and how they work. We also briefly cover how pregnancy starts.

With the marine segmented worms covered, let's get a closer look at Oligochaeta and Hirudinea, which include the familiar earthworms, and the leeches. The anatomy and physiology of the common earthworm is actually quite fascinating,...

What happens to your brain BEFORE birth? Growing an entire mind in nine months is a pretty enormous accomplishment! A baby's brain goes from just a couple of cells to a neuron-dense powerhouse. But what does the brain development of a...

Brit looks back on our fourth month on Nature League, when we explored the theme of sex and reproduction.

In this episode of "From A to B", Adrian asks Brit how humans came up with tales about sea monsters.

Fertilization. How does it happen? In this video, we discuss the male and female reproductive systems and how they work together to create an entire new human.<br/>

Do you know how twins are made? I was surprised to learn how many people thought they knew but didn't. In this video, I clear up any confusion related to twinning (from a biological perspective). Watch this video and impress your friends...

Evolution “is the net change in organisms or a population over the span of many generations.” This change in organisms or populations happens through DNA mutations and reconbination and is passed down to the next generation through...

This engaging video program uses colorful animations and on-location footage to illustrate some of the amazing ways plants reproduce. The reproduction processes in bryophytes, ferns, gymnosperms, and angiosperms are highlighted....

In this De-Natured segment of Nature League, Brit breaks down a recent scientific journal article about the effects of childhood trauma on adult sperm cells of mice and men. Article citation: Dickson, D.A., Paulus, J.K., Mensah, V., Lem,...

Not all hypotheses need to be good. In fact, many of them are terrible. It’s just that when you’re trying to understand the world, you might find yourself believing that there are tiny humans living inside the heads of sperm, and we're...

Syracuse University biologists are now able to study previously unobservable events tied to sexual selection. That's because they were able to genetically alter fruit flies so that the heads of their sperm were fluorescent green or red....

Syracuse University biologists are now able to study previously unobservable events tied to sexual selection. That's because they were able to genetically alter fruit flies so that the heads of their sperm were fluorescent green or red....

In this Nature League Field Trip, Brit goes on a Montana safari at the National Bison Range and shares some local stories of how species have persisted over time via reproduction.

Evolution has evolved the human body over thousands of years, yet we are still discovering new things about our bodies. From the mesentery, to the second nose, AllTime10's brings you 10 Body Parts You Never Knew Existed.

Sperm counts have fallen by more than 50% in the past four decades. To understand what’s going wrong with men, we need to stop seeing fertility as a woman's problem

Genetics | Process of Oogenesis

A scientist in China has been under scrutiny for allegedly using CRISPR, a gene-editing tool, to create the first gene-edited babies.

In this video, the concept of contraception is explained, which is the prevention of pregnancy. The video looks at various methods of contraception and explains how they work. The video looks at several examples of both types of...

Male Repro

In this video, we will examine the precise site of fertilization and then follow the physical path of the secondary oocyte (egg) and sperm cell (spermatozoa) to fertilization.

The video discusses cell specialization, explaining how cells are structured differently to suit their functions. Three types of specialized cells are examined, including sperm cells, egg cells, and ciliated epithelial cells. The video...

I am not sure which virus is currently hijacking my cells, but I'm going to go to bed now and hope it improves. Thanks for being here.