I lose sleep if I end up feeling bad about something I've said. Usually that happens when I send something out without having read it over a few times, or when I call somebody names.

The sharp thorn often produces delicate roses.

A guilty conscience needs to confess. A work of art is a confession.

If the only time you think of me as a scientist is during Black History Month, then I must not be doing my job as a scientist.

Today the theory of evolution is about as much open to doubt as the theory that the earth goes round the sun.