Quiz, in 6 thematic areas (general; scripts and writing; etymology; countries and languages; language families; miscellaneous), in which you may learn how much you don't know.
Interactive game: official languages of Europe.
To be monolingual is to be dependent on the linguistic competence, and goodwill, of others. Learning to use another language is about more than the acquisition of a useful skill — it reflects an attitude, of respect for the identity and culture of others and tolerance of diversity.
See The Literary Saloon for links to articles on second-language stats and rankings.