One of the great unanswered questions in science is how the first building blocks of life arose from the primordial soup of early earth. It is believed that before even the simplest of life forms existed, earth was something like a thin stew that was getting thicker as more complex chemicals formed. At some point, and no one knows how, the first DNA molecules formed. The prevailing theory is that the first genetic molecule was a primitive form of RNA, which evolved into more complex RNA and then DNA.

No one knows how this could happen only that it happened. The proof of which is all around us, including in the mirror. Life exists and it is based in DNA. Further, RNA is created from DNA to put that information to work, like controlling the creation of proteins and performing other chemical functions. How DNA became the code of life, while RNA, its predecessor, became its tool, is a great mystery in science. It is the question J.F. Gariepy tackles in his book The Revolutionary Phenotype.

Gariepy or “JF” as he is known by his fans, is an enigmatic YouTube personality, known for his willingness to talk with anyone. He has had everyone from science deniers to holocaust deniers on his show, as well as lots of normal people. His YouTube career is recent, as until 2017 he was a neurobiologist and post-doctoral researcher at Duke University’s Institute for Brain Sciences. In this book, he endeavors to explain the origin of life 4 billion years ago and predict the end of DNA-based life on earth.

One of the challenges facing writers of science books for a general audience is that they must first simplify the presentation. It is not that the audience is dumb, but that they are unfamiliar with the jargon and unfamiliar with the way people in science communicate information through mathematics. A book full of complex proofs and splatter charts is not going to be popular with most readers. Gariepy gets past this first obstacle by sticking with a straightforward narrative format that is easy to follow.

The second challenge for science writers is to follow the old rule about essay writing that kids learn in school. The book should always be like a woman’s swimsuit; big enough to cover the important parts, but small enough to keep it interesting. This is probably a good rule for all writing in this age. Thanks to the internet and cable television, everyone’s attention span has collapsed. Gariepy gets past this hurdle, as the book is just 138 pages and written in a brisk style that makes for easy reading.

The question is, of course, does Gariepy deliver on his promise to explain the origin of life and how it will end. The answer is an unequivocal maybe. On the positive side, he does a very good job of explaining one possible narrative for how primitive RNA evolved into RNA and then DNA. He offers up an interesting theory as to how DNA came to be the master and RNA the slave, which is an important event in the history of life. The presentation here is a nice primer for the general reader on the basics of genetic theory.

What really works here is his use of simple concepts that he stacks together to explain more complex ideas. For example, describing the relationship between your genes and your body as something like the relationship between a machine operator and the machine, is useful in understanding why our bodies will evolve over time. Our body is there to serve our genes, so any innovation that is better for our DNA is adopted, while changes that are not useful are discarded. Our body is a vehicle for DNA.

The negative here is that the language and analogies do not always work. Using the office printer to explain how gene mutation works is clever but calling it a trickster printer will give the American reader the wrong impression. The same is true for his use of the phrase “fool replicator.” This is probably a language issue, as Gariepy is French. The word trickster and fool have different connotations to French speakers than they do to English speakers, especially Americans, who think tricksters and fools are immoral.

Another complaint about the book, and one of the trade-offs with brevity, is it assumes the reader has recently read Daniel Dennet and Richard Dawkins. In fact, it is probably a good idea to read The Selfish Gene before reading this book, as Gariepy refers to it extensively in the first third of the book. Again, this is the trade-off that comes from brevity and summarizing the material for a general audience. In this case, it is a minor complaint, and it does not ruin the book or invalidate his arguments.

The final complaint about the book is that he spends 80% of the text explaining the transition from simple RNA molecules to the complex DNA-based life. That is about 100 pages, which is a great short primer on a difficult to understand subject. The rest of the book is a dash to the finish line, explaining how the rise of artificial intelligence spells the end of DNA-based life. There is a strong impression that this part was rushed in order to get the book done and ready for sale. The book sort of ends with a thud.

Without giving too much away, Gariepy argues that RNA used DNA as sort of a bank vault for its code base. When it needed to copy itself, it did so from that copy stored in the DNA molecule. Eventually, the DNA molecule was able to replicate itself, without help from its RNA master. This set off a battle between RNA and DNA, which DNA won, turning RNA into its servant. This same process is about to happen with artificial intelligence, as AI becomes self-aware and able to self-replicate.

That sounds like the premise of a lot of science fiction stories, but it is both an interesting entry point to understanding artificial intelligence and the dynamic between environment, humans, and man’s ability to alter his environment. There is enough there for another book and maybe that is the plan, but Gariepy only gives it about twenty pages, and it felt very rushed. Given his YouTube audience, most of his readers are more interested in how life ends, rather than how it begins. They will undoubtedly feel a bit cheated.

Overall, the first half of the promise, to tell the story of how life began, works pretty well for the intended audience. It is not a research paper or a bold new hypothesis to explain the origin of life. It is more of a summary of current thinking in a style that the general reader can follow and understand. The second promise could have worked, but it needed a fuller treatment than what Gariepy delivers. Otherwise, it is a book worth reading, if you have an interest in evolutionary biology or the origins of life on earth.