Handedness is important in neuroscience as there are functional asymmetries for things such as language. Pretty much all right-handed brains have language later

Handedness is important in neuroscience as there are functional asymmetries for things such as language. Pretty much all right-handed brains have language lateralized to the left side, whereas around 70% of left-handers also have language lateralized to the left side. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4219560/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4219560/ So if a person is left-handed it's unknown if the lateralization of various functions in their brain is the same as a right-hander or if things are mapped in strange places. Left-handers also have higher rates of schizophrenia and other disorders. I say this as a left-hander who is doing his PhD in neuroscience, haha.