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... so what is your question?

When you want trusted information — product recommendations, travel suggestions, local tips, or career advice — a real conversation with a friend (or friend-of-friend) can be much more helpful than searching the web. Aardvark is easy: just send Aardvark a question in plain English, like you do when talking to a friend. Aardvark figures out who might be able to answer, and asks on your behalf — Aardvark is the hub. It’s all about people...

A claim to have solved one of the most difficult riddles in mathematics has been challenged by scientists. Vinay Deolalikar, a mathematician based at Hewlett-Packard laboratories in California, US, claims to have solved the problem of P vs NP. This has been described as the biggest problem in computer science; it is one of seven Millennium Prize Problems set out by the Clay Mathematics Institute. But maths experts have weighed in to point...

I hope kids are still finding some way, despite Google and Wikipedia, of not knowing things. Learning how to transform mere ignorance into mystery, simple not knowing into wonder, is a useful skill. Because it turns out that the most important things in this life — why the universe is here instead of not, what happens to us when we die, how the people we love really feel about us — are things we’re never going to know.