Physicist Jim Al-Khalili routinely deals quantum physics, the perplexing theory of sub-atomic particles. But now he's turning his attention to the world of nature. Can quantum mechanics explain the greatest mysteries in biology? His first encounter is with the robin. This familiar little bird navigates using one quantum entanglement, a process which seems to defy common sense. Even Albert Einstein himself could not believe it. Jim finds that even the most personal of human experiences-our sense of smell-is touched by ethereal quantum vibrations. According to the latest experiments, it seems that our quantum noses are listening to smells. Jim then discovers that the most famous law of quantum physics, the uncertainty principle, is obeyed by plants and trees as they capture sunlight during the vital process of photosynthesis. Finally, Jim asks if quantum physics might play a role in evolution. Could the strange laws of the sub-atomic world, which allow objects to tunnel through impassable barriers, affect the mechanism by which living species evolve?