I Believe There Are 15, 747, 724,

Don't Believe The Results Of Experiments Until They're Confirmed By Theory.

Shuffling Is The Only Thing Which Nature Cannot Undo.

To The Pure Geometer The Radius Of Curvature Is An Incidental Characteristic - Like The Grin Of The Cheshire Cat. To The Physicist It Is An Indispensable Characteristic. It Would Be Going Too Far To Say That To The Physicist The Cat Is Merely Incidental To The Grin. Physics Is Concerned With Interrelatedness Such As The Interrelatedness Of Cats And Grins. In This Case The "cat Without A Grin" And The "grin Without A Cat" Are Equally Set Aside As Purely Mathematical Phantasies.

When An Investigator Has Developed A Formula Which Gives A Complete Representation Of The Phenomena Within A Certain Range, He May Be Prone To Satisfaction. Would It Not Be Wiser If He Should Say 'foiled Again! I Can Find Out No More About Nature Along This Line.'

[when Thinking About The New Relativity And Quantum Theories] I Have Felt A Homesickness For The Paths Of Physical Science Where There Are Ore Or Less Discernible Handrails To Keep Us From The Worst Morasses Of Foolishness.