The physics of undergraduate text-books is 90% true.

Ethics is not just an abstract intellectual discipline. It is about the conflicts that arise in trying to meet real human needs and values.

The 'size' of science has doubled steadily every 15 years. In a century this means a factor of 100. For every single scientific paper or for every single scientist in 1670, there were 100 in 1770, 10,000 in 1870 and 1,000,000 in 1970.

The physics of undergraduate text-books is 90% true.

A new scientific theory is seldom stated with such clarity by its original author, and usually takes many years to creep into public conciousness.

The physics of undergraduate text-books is 90% true; the contents of the primary research journals of physics is 90% false.