Hawking's Time and Space on top of Guinness :p , Irish Pub 'Dora Keogh' Danforth St. Toronto Apr 7 2010

What is time?
Is it an ever-rolling stream that bears all our dreams away, as the old hymn says?
Or is it a railroad track? Maybe it has loops and branched, so you can keep going forward and yet return to an earlier station on the line..

'Einstein's general relativity gives time a shape.
How this can be reconciled with quantum theory.'

.. 'The shape of Time' Chap 2. A Brief History of Time.. Stephen Hawking