schoolchildren

Schoolchildren show their hands decorated with henna paste during a henna competition to mark World Population Day in the western Indian city of Ahmedabad...Schoolchildren show their hands decorated with henna paste during a henna competition to mark World Population Day in the western Indian city of Ahmedabad July 11, 2014.

Amit Dave/Reuters

Schoolchildren show their hands during a henna competition to mark World Population Day in the city of Ahmedabad, India

Sri Lankan schoolchildren play rugby on a beach during sunset in Colombo on July 3, 2013. Sri Lanka's youth population aged 10 to 19 make up some 15 percent of its 20 million people.

Lakruwan Wanniarachchi/AFP

Sri Lankan schoolchildren play rugby on a beach at sunset in Colombo on Wednesday. Sri Lanka‘s youngsters aged between 10 and 19 make up some 15 per cent of the country’s 20m population

Schoolchildren watch as "Inuka",

Roslan Rahman/Getty Images

Schoolchildren watch as “Inuka”, a male polar bear, swims in its enclosure at the Singapore Zoo on Wednesday. The 22-year-old polar bear, the first one born in the tropics, moved into his new frozen tundra home on May 29 in a 2,700 sq m exhibit featuring climate controlled resting areas and an expanded pool