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Tim Harford explains why the technology giant Apple is not bigger than Poland, as media reports have claimed. He explores more meaningful ways to compare the relative size of companies and countries. And he finds that although Apple may not be worth more than Poland, it could still be considered one of the biggest 'economies' in the world. HOW SAFE IS SAFE? Tim scrutinises the claim that the Millennium Development Goal on safe drinking water has been achieved ahead of schedule. The World Health Organisation, which along with Unicef announced that the target had been met, concedes that the numbers are not actually that certain. Producer: Ruth Alexander (Image: A Sudanese child drinking clean water. Credit: AFP/Getty Images)