*[http://www.telegraph.co.uk/education/educationnews/4548943/British-teenagers-have-lower-IQs-than-their-counterparts-did-30-years-ago.html British teenagers have lower IQs than their counterparts did 30 years ago], ''The Telegraph'', 2009 | *[http://www.telegraph.co.uk/education/educationnews/4548943/British-teenagers-have-lower-IQs-than-their-counterparts-did-30-years-ago.html British teenagers have lower IQs than their counterparts did 30 years ago], ''The Telegraph'', 2009 |