Rahul Gandhi caused a flutter in the party when he declared that he is ready to take charge of campaigning for the May 8 by-election.

His win over the Hungarian, who beat him last year to win the title, has given him four points in five rounds and the lead.

If you want to say "hello" to everyone on the planet, you would have to learn at least 2,796 languages and greet at least 7 billion people. It could be really handy if you are traveling or just want to know someone from a different culture. Here are some...