A theory of creativity -- The creative environment -- Thoughts on the random-ideas generator -- Intuition and odd notions -- Creativity in scientific papers -- Heat and gravity -- Astronomical musings -- Rotating things -- Explosions and fuses -- Tricks with optics -- Properties of materials -- Physical phenomena I have noticed -- Odd notions I have played with -- Literary information -- Inventions we need but don't have -- A list of silly questions -- A short guide to being creative.