My grammar book states that both "wieso" and "warum" mean "why" but my friend who lived in Germany for one year states there's a subtle difference in questioning between them but couldn't really elaborate further.
Does anyone have any examples of the difference?
My book states you can use both in this sentence:
Wieso hast du das gemacht?
Warum hast du das gemacht?
but of course that doesn't help me in the differentiation of the usage.
weswegen
being rather strange here due to its length relative to the length of the whole sentence. – Toscho Jan 19 '14 at 15:47