If someone were to ask you what an antelope or a coffee cup or a bulldozer looks like, you could give them an answer. Now think back to high school biology if you are able. What if someone asked you “What does a cell look like”? Anyone could answer that. Because, of course, you either remember the cell membrane, the nucleus, the mitochondria, and so forth --- or you look it up on the internet. Either way, you could give an answer to the question “What does a cell look like?” The question you could not give an answer to is “What does a stem cell look like”? It may seem odd that there is no answer to that question. After all, tens of thousands of scientists have work millions of lab hours studying stem cells. So why is there no answer?