Entering a cell and watching its entire inner machinery at work, how DNA is copied, how proteins are assembled, or how it splits in two, has been, for decades, an impossible dream. Now, scientists at the University of Illinois have recreated everything that happens inside a cell at molecular scale in an unprecedented computational model. Syn3A is the first 4D digital cell, capable of combining time and space to simultaneously represent all the internal processes that drive the life cycle of a minimal prokaryotic organism.