"The kingdom of Cornucopia was once the happiest in the world. It had plenty of gold, a king with the finest moustaches you could imagine, and butchers, bakers and cheesemongers whose exquisite foods made a person dance with delight when they ate them. Everything was perfect _ except for the misty Marshlands to the north, which according to legend, were home to the monstrous Ickabog..." _ jacket.

Reluctant hero Hiccup Horrendous Haddock III must rescue his best friend, Fishlegs, from the deadly disease Vorpentitis. The only cure is rare and almost impossible to find ... a potato. But where will Hiccup find such a thing?

"The Wizard boy Xar and the Warrior girl Wish must learn to work together in order to find the ingredients for an ancient Witch-killing spell if they are to save the wildwoods"--

Text and experiments demonstrate the nature and uses of energy in its various forms.