Search engine is calling for web users to help shed light on its Top 10 "unanswerable" questions, in a bid to celebrate its 10th anniversary.

The search engine, which was originally known as Ask Jeeves and launched in 2000, has put together a dedicated website detailing the 10 most popular questions that do not have a simple answer. They include 'What is the meaning of life?', 'Do blondes have more fun?' and 'What happened to Tony Soprano?'

Web users can post their own answers to the questions, while also reading suggested answers from celebrities including Sarah Beeny, hairdresser Nicky Clarke and TV critic Kevin O'Sullivan.

"Jeeves prides himself on being able to answer 16 million questions a month, and has been doing so for ten years now. But even we have to admit that occasionally there is going to be a question where there is no simple answer, so we're letting our users do it themselves," said Nadia Kelly, spokesperson for the site.

"We want to encourage our community to get involved and come up with the answer to the unanswerables, whether it is funny or philosophical."

When first launched, the search engine featured a fictional butler called Jeeves, based on a character created by PG Wodehouse, that appeared in the search engine's name and branding until 2006, when he was given the boot. However, Ask re-introduced the character last year due to "user demand".

Ask said it will make the interactive section a permanent feature later in the year.

See also: better results, smaller market share