```ruby
FuelMarket.seed_many([
  {:id => 1, :name => "Wind",
      :description => "The movement of air."},
  {:id => 2, :name => "Sun",
      :description => "Solar radiation."},
  {:id => 3, :name => "Water",
      :description => "The movement of water."},
  {:id => 4, :name => "Natural Gas",
      :description => "TODO"},
  {:id => 5, :name => "Coal",
      :description => "TODO"},
  {:id => 6, :name => "Gasoline",
      :description => "TODO"},
  {:id => 7, :name => "Low-enriched Uranium",
      :description => "TODO"},
  {:id => 8, :name => "Highly-enriched Uranium",
      :description => "TODO"},
])
```

Add defaults to fixtures for fuel markets.
user
```ruby
FuelMarket.seed_many([
  {:id => 1, :name => "Wind",
      :description => "The movement of air.",
      :initial_average_price => 42,
      :initial_standard_deviation => 4},
  {:id => 2, :name => "Sun",
      :description => "Solar radiation.",
      :initial_average_price => 42,
      :initial_standard_deviation => 4},
  {:id => 3, :name => "Water",
      :description => "The movement of water.",
      :initial_average_price => 42,
      :initial_standard_deviation => 4},
  {:id => 4, :name => "Natural Gas",
      :description => "TODO",
      :initial_average_price => 42,
      :initial_standard_deviation => 4},
  {:id => 5, :name => "Coal",
      :description => "TODO",
      :initial_average_price => 42,
      :initial_standard_deviation => 4},
  {:id => 6, :name => "Gasoline",
      :description => "TODO",
      :initial_average_price => 42,
      :initial_standard_deviation => 4},
  {:id => 7, :name => "Low-enriched Uranium",
      :description => "TODO",
      :initial_average_price => 42,
      :initial_standard_deviation => 4},
  {:id => 8, :name => "Highly-enriched Uranium",
      :description => "TODO",
      :initial_average_price => 42,
      :initial_standard_deviation => 4},
])
```
assistant