I know I'm just an old fasioned girl and probably the boringest pedant, but at my institute we won't allow our students to use 'data' as singular. Moreover, we issue them with lists of lots of words which come from Latin and which are commonly used in their disciplines AND which we insist on them using according to their Latin plural/singular status. The usual words such as: criterion/criteria, medium/media, addendum/addenda, quantum/quanta, genus/genera, formula/formulae etc. Are we hopelessly out of kilter and fighting a losing rear-guard action?