41.   The aviation world today is highly competitive.

42.   The entertainment world has always been fond of him.

43.   The natural world was an open book to him.

44.   The outside world is, for the social actor, the opposite of his own home ground.

45.   The real world would not be so forgiving.

46.   The whole world is your paintbox, and nothing pleases you more than to contemplate exquisite, natural things.

47.   The world is an increasingly complicated and dangerous place, they say.

48.   The world is full of continuous change, however, and predictive networks will need to handle time-varying data.

49.   The world is full of mind-bending substances.

50.   The world is full of stray cats, many of them searching hopefully for a new home.