Scientists have captured rare footage of a sperm whale giving birth, offering a window into the large mammals' behavior.

What if sex isn’t entirely left to chance? In humans, sex determination is usually described as a random process. The egg always carries an X chromosome, while sperm either carry an X or Y. When ...

While humans often struggle to find a partner who is both physically attractive and a reliable co-parent, yeast may already have cracked the formula for the perfect match. When choosing mates, these ...