One might doubt whether the other complexities of intelligent life lend themselves so readily to mathematical treatment.
The Times Literary Supplement (2013)
How can'less than one' planet in the galaxy have intelligent life on it?
Times, Sunday Times (2009)
Imagine that on only a handful of these worlds life evolved into intelligent life and built a civilization.
The Sun (2011)
The chances for intelligent life look very different.
Times, Sunday Times (2010)