Sublime

identify when she’s on the verge of ovulating, a woman can track several things. First, changes in her cervical mucus: it becomes thin, clear, and slippery like egg white right before ovulation. Or she can monitor her basal body temperature—first thing in the morning, before getting out of bed—because it will rise about half a degree when ovulation

The ootheca, itself, is a marvelous construction, designed to offer the right amount of humidity and correct temperature for the fertilized eggs to develop. In the ootheca of the German cockroach, for instance, there is a little space left above the compartment for each egg that has a microscopic opening to the outer air.