USAs 16-year-old 800m star Cooper Lutkenhaus misses school and semi-final at world championships

Teenager is youngest ever US athlete at world champsTexan finishes seventh in heat, well of personal bestCooper Lutkenhaus must have the best excuse for missing class of any high school junior, given he has been in Japan these past two weeks preparing to compete for Team USA at the World Athletics Championship.But the 16-year-olds dream of reaching the 800m final ended in the opening round on Tuesday as he could only finish seventh in the sweating heat of Tokyo.