Time is precious, I do this for many reasons but my biggest joy is unlocking the secrets that time has clouded over. For me it's very interesting finding out not only when someone was born or died but their occupation (which vary greatly), and how spread out the roots of my tree go. Their trials and tribulations, great feats or minor accomplishments.
If I can assist feel free to ask, I try not to make mistakes but they happen. I can't change the information on a headstone no matter how incorrect it is. If a note is needed to acknowledge an error please give citation data to back up your claim. I'll gladly add that to a memorial so everyone is aware.