This Is One Of Man's Oldest Riddles.

Scientific Work Will Never Stop, And It Would Be Terrible If It Did. If There Were No More Problems, You Would Put Your Hands In Your Pockets And Your Head On A Pillow And Would Work No More. In Science Rest Is Stagnation, Rest Is Death.

Thus, The Photons Which Constitute A Ray Of Light Behave Like Intelligent Human Beings: Out Of All Possible Curves They Always Select The One Which Will Take Them Most Quickly To Their Goal.

It Is Never Possible To Predict A Physical Occurrence With Unlimited Precision.

The Whole Strenuous Intellectual Work Of An Industrious Research Worker Would Appear, After All, In Vain And Hopeless, If He Were Not Occasionally Through Some Striking Facts To Find That He Had, At The End Of All His Criss-cross Journeys, At Last Accomplished At Least One Step Which Was Conclusively Nearer The Truth.

An Experiment Is A Question Which Science Poses To Nature And A Measurement Is The Recording Of Nature's Answer.