How Fast Do Embryos Grow?

• Read more about Nervous Systems

Picture an animal cell. Maybe it’s small and rectangular, like some skin cells. Maybe it’s small and circular, like some white blood cells. Maybe it’s small and branched, like some nerve cells. Or maybe it’s big—about a meter long—and wire thin. (Wait… what?) Cells this long do exist, though they are rare. To find the longest cell that we know of, we must dive into the deep, dark depths of the ocean, and imagine looking inside of a giant squid.