Trying to keep tabs on how an organism grows from a single fertilized egg into an embryo, cell by cell, is hard work. So hard in fact, that no one’s quite figured out how to do it. The problem, as researchers have lamented, is that there’s just too much happening—all at the same time—for the … Continue reading A Glimpse Inside the Cellular Universe: Scientists Track the Growth of an Organism, One Cell at a Time