Learning a second language can be difficult and even after years of studying one will never be as fluent as native speakers. This is not the fault of the individual because neurologically, humans are not designed to learn language beyond a critical period (Jacqueline S Johnson, & Elissa L Newport). A critical period describes a duration between infancy and puberty where the nervous system is hypersensitive to the environment which allows for certain systems to rapidly develop: vision, hearing, vestibular system and language. Researchers found that people who passed this period were unable to acquire their first language fluently (Naama Friedmann & Dana Rusou). Not that people are unable to acquire language – rather they acquired language as one would acquire a second language: slow, inefficiently, and lacking in fluency. Now an idea is that second language is acquired differently because of the lack of newer neurons. As described by T. Nakashiba and colleagues, new neurons from neurogenesis (in the hippocampus) learn differently from existing neurons. New neurons use “pattern separation” where they take new information and compare their differences in order to comprehend their world. Existing neurons work differently using “pattern completion”; which detects similarities – using existing memories for comprehension. Newer neurons in young children could explain why they are able to learn their first language to such proficiency and fluency. Recently differentiated neurons with no pre-existing synaptic connections could potentially explain the critical periods of language acquisition. Neurogenesis is the process by which new neurons in the brain are formed. Neurogenesis occurs throughout an individual’s life into adulthood but never quite reaches the levels seen during fetal development. If we were to stimulate neurogenesis within certain regions of the brain, i.e. the hippocampus’s dentate gyrus which has been established to be critical in the formation and retrieval of long-term memory, it is possible to increase one ’s ability to learn concepts such as language. Bromodeoxyuridine (BrdU) is a thymidine analog used to measure neurogenesis (Peter S. Eriksson et al in Neurogenesis in the adult human hippocampus). Using various methods such as acupuncture, exercise, music, emotional-environmental stimulation, pharmaceutical drugs, or genetic engineering via BNDF we could potentially recreate that language acquisition period in adulthood. Scientists (Sama F Sleiman et al.) found that exercise caused platelets to release growth factors BDNF (Brainderived Neurotrophic factor) of neural precursor cells within the hippocampus. They found that mammalian brains were better with memory and spatial learning. Sama Sleiman’s research suggests that lactate release from muscles during exercise induces a certain gene expression that aids with this increased learning ability. BDNF can be synthesized however the mechanism that allows the brain to absorb BDNF has yet to be discovered. An alternative would be to create a pharmaceutical drug that can stimulate BDNF synthesis within brain such as BHB(beta-hydroxybutrate), a ketone body produced by the liver. Neurogenesis could help individuals can learn a second language to the same fluency as native speakers with much less time investment. Applications are not limited to just language acquisition. According to linguists (Neural Mechanism of Language, Peilei Liu, Ting Wang), language is a concept; a system of signs for encoding and decoding information. Understanding coding language or science & theories to same fluency as a language is also a potential area that can be positively impacted by neurogenesis as they are all concepts like language.