You know what they say: 'variety is the spice of life'. [=life is more interesting and enjoyable when you do different things]
The talks covered a wide/great 'variety of' topics. [=the talks covered many different topics]
I was surprised by the 'variety' of the choices that were available.
(..) favouring different kinds of animals and plants. Less than percent of the sunlight reaches the floor, but even here there is extraordinary variety. In the great island of New Guinea there are different species of birds of paradise, each more bizarre than the last. This forest is so rich (..)2006 TvShow: Planet Earth Title: From Pole to Pole Season: 1 Episode 1