Artificial Intelligence

After attending a very interesting class this evening, I asked three artificial intelligence websites the following question:

"How do we know how old the Earth is?"

In response, Cleverbot said We don't know what is not proven.

Elbot said, In view of the vastness of our universe I am struck by the inconsequence of human reason and the immeasurability of artificial intelligence.

And A.L.I.C.E. said, Just keep talking to me as long as you can.

As a consequence, I'm not sure if this means computers are very, very profound, or very, very stupid. If anyone with experience of AI could tell me, I'd be very pleased to hear from you.
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