Not sure what we can conclude from this graph. Why it is not normalized? https://pubmed.ncbi.nlm.nih.gov/?term=illness https://pubmed.ncbi.nlm.nih.gov/?term=il

Not sure what we can conclude from this graph. Why it is not normalized? https://pubmed.ncbi.nlm.nih.gov/?term=illness https://pubmed.ncbi.nlm.nih.gov/?term=illness - try any common word and you will see that it grows just because of number of papers. https://pubmed.ncbi.nlm.nih.gov/?term=lucid https://pubmed.ncbi.nlm.nih.gov/?term=lucid - try any less common word and you may also see spikes, not in 2023, but in 2020, or somewhere else. Try to look deeper and probably find some common n-gram people started to study and repeat after each other ("lucid dreams" in this case). Normalize and don't extrapolate from a single point (see https://xkcd.com/605/ https://xkcd.com/605/).