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year. but in virginia, one educator is staying put for the long haul. here's cbs' scott macfarlane. >> reporter: he hits the treadmill to keep up his endurance in strength. he's in his 63rd year teaching math in northern virginia. and that adds up to thousands of students. >> 6,400 students. >> some of them are doctors and lawyers. >> reporter: you teach the children of your former students. do you teach the grandchildren of your former students? >> i think i had one. >> reporter: he's also had student like mark eisenhower become federal teachers and then beat him to retirement. he's been here nearly 30 years. you graduated, you had a 30-year career. you retired. he's still here. how is that?>> . dn'thi ipossib nt when i wasnt te it's only po