Thanks a lot for the hit :)
I'm to solve this puzzle. I suppose it'll make me much time - English is not my native language.
Anyhow I enjoyed the course.
Some time ago I was not lucky to pass this course (for the first and the second part of the course have the different dead lines - I've missed the Midcourse deadline... alas). But I was lucky to jump into the Advanced Power Searching with Google, do all the tasks, and get the Certificate (my Final assessment was about my cat Diesel - how I learned what breed is he).
Some years passed and in tis new course I'd leaned many new things, for "Google is inventing tevery day the new thing",- as Dan said.
Many thanks for your great job,
Natalia