How do we grow from a single fertilized egg into a fully grown person with trillions of cells? Our cells divide, of course!
And it's no mean feat. Each time a cell divides, it must duplicate our 23 pairs of chromosomes and make sure each "daughter" cell ends up with a complete set of genes.
Errors are potentially fatal to the cell. Runaway cell division, which is the hallmark of cancer, is also serious business.
No wonder then that biologists have been studying cell division for as long as they've known about cells.