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Ted Phillips asked the Naked Scientists: Hello,The 'terrible twos'; defined by Wikipedia as 'A child developmental stage which normally occurs around the age of two (but can start earlier) and consists of toddlers often saying no and throwing temper tantrums.'This can be quite a traumatic time for parents, comparable to the later stage of 'teenage tantrums'. [Seconded. Ed.]I can appreciate how the latter has evolved: Teenagers are sexually mature and are no longer in need of parental care and nurture, so that 'in the wild' (i.e. not constrained by any social niceties) parents would at this stage, chase them away to start their own families and allow the parents to devote their attention to any younger siblings of the teenagers: Thereby increasing the possibility that the parents' genes propagate throughout the population. Here's my question:What is the evolutionary advantage of the 'terrible twos'?Keep up the good work!Regards,Ted PhillipsWhat do you think?