In the True or False puzzle on page 46, one of the statements is, "Per UN estimates, the world's population topped 6 million in 1997." This is false because the world's population topped 6 BILLION in 1999. But in the answers, it says, "False (the 6 MILLION mark was topped in 1999 per UN and other estimates).

For everybody in the UK, where one billion is a one followed by 12 zeroes, in the US, one billion is a one followed by 9 zeroes.