Every living cell contains DNA — a molecule that stores biological instructions in a four-letter chemical alphabet (A, T, G, C). The human genome contains approximately 3.2 billion base pairs encoding roughly 20,000-25,000 genes. This information is read, copied, error-corrected, and executed by molecular machinery of staggering complexity.
The key insight from information theory is that DNA does not merely contain complexity — it contains specified complexity. It carries functional information: instructions that direct the construction of proteins, regulate gene expression, and orchestrate development from a single cell to a complete organism.
All known experience demonstrates that functional, specified information originates from intelligent minds. Books, computer code, blueprints, and language all come from intelligent sources. No known natural process generates specified information from scratch.
Stephen Meyer, a philosopher of science at Cambridge, argues that the best explanation for the origin of biological information is an intelligent cause. He draws on the work of information theorist Henry Quastler, who noted that the creation of new information is habitually associated with conscious activity.
The challenge for naturalistic origin-of-life research is explaining how the first self-replicating information system arose from chemistry alone. Despite decades of research, no plausible naturalistic pathway has been demonstrated for the origin of the genetic code, the translation system (ribosome), or the first functionally specified proteins.