Such observations might seem ho-hum today, but they were unprecedented at the time. Robert Hooke had coined the word “cell”—short for cellula, or “small compartment” in Latin—in the mid-17th century, ...

Warning: It gets weird. Before we jump into how wrong many of history's great thinkers were, here's what we know now. A sperm cell and an egg ... But his theory of evolution kind of needed ...

For example, the endothelial tissue that lines the human gastrointestinal tract consists of several cell types. Some of these cells absorb nutrients from the digestive contents, whereas others ...