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.
(..) here in their natural home they form great forests and fill the landscape with the covers of a new season. These forests are a host to a rich variety of springtime migrants. Beneath the blooms - another display. It's the mating season for oriental pheasants, Himalayan monal, tragopan (..)2006 TvShow: Planet Earth Title: Mountains Season: 1 Episode 2