The unprepared mind cannot see the outstretched hand of opportunity.

The time may come when penicillin can be bought by anyone in the shops. Then there is the danger that the ignorant man may easily underdose himself and by exposing his microbes to non-lethal quantities of the drug make them resistant.

Rule No. 1: Never lose money. Rule No. 2: Never forget Rule No. 1.

-- Warren Buffett

Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.

-- Albert Einstein

A new scientific truth does not triumph by convincing its opponents, but rather because its opponents eventually die and a new generation grows up familiar with it.

-- Max Planck

An expert is a man who has made all the mistakes which can be made, in a narrow field.

-- Niels Bohr

However difficult life may seem, there is always something you can do and succeed at.

-- Stephen Hawking

If I have seen further it is by standing on the shoulders of Giants.

-- Isaac Newton