For thousands of youngsters, crucial exams are nigh. Many say the pressure on students should be minimised, but should people just accept it as a fact of life, asks Matthew Syed.
. Iguazu, a towering mass of roaring water and churning spray, spans 2.5km, straddling Argentina and Brazil. It is easily reached from either side of the border as well as from nearby Paraguay. (Karen Bowerman)