The hardest thing in the world to understand is the income tax. >>
The most evident difference springs from the important part which is p >>
Things should be made as simple as possible, but not any simpler. >>
The best way to escape from a problem is to solve it. >>
All problems are finally scientific problems. >>
No problem can withstand the assault of sustained thinking. >>
The significant problems we face today cannot be solved at the same level of thinking we were at when we created them.