21.   I simply like to imagine there is intelligent life somewhere up there.

22.   If intelligent alien life ever gets discovered this way, the person whose computer actually caught that first signal will get a small share of the glory.

23.   If so, does that diminish prospects for intelligent life existing elsewhere in the universe?

24.   In it, Hawking ranges over the beginnings and evolution of life, and finally intelligent life, on Earth.

25.   Is there intelligent life inside that useless shell?

26.   It is not his job to convince skeptics of the possibility of intelligent life beyond this planet.

27.   It may not be exactly what we think it ought to be, but it will be intelligent life.

28.   It presupposes that, prattle about the millennium notwithstanding, intelligent life has been found here.

29.   Krauss believes millions of planets around other stars in the universe harbor life, although far fewer probably have intelligent life.

30.   Michael D. Papagiannis led an international effort to find intelligent extraterrestrial life.