Difficult for me, but fun. I learned a lot from the comments!

Wow - somehow I feel good about the D+...

C+ but I sure had fun!

I learned some interesting things. I read a lot of 'classic' (i.e., old) SciFi, and I've often come across references to the "Heaviside layer." From the context, I could guess more or less what the authors were talking about, but was totally baffled by the name. I wondered if early 20th Century physicists thought the ionosphere was was made of heavy particles that reflected radio waves. Well now I know that the name "Heaviside layer" is just an artifact of a name. Thanks, cnmne.

My mother gave me "Laughing Boy" years ago. got the answer right because I remembered the author's name on the spine of hte book. It's been sitting on my bookshelf forever. I guess I should read it.

Boy, talk about the lowest common denominator! It's like a pit most of us fell into.

Not the best score but at least I was over the 50% mark! I learned quite a bit! Thanks!

Tough quiz! Thank you for the challenge. I didn't do so well, but it sure made me think!

D+ 7-13 not AD CONSIDERING I GUESSED AT every question lol good quiz hard quiz

I agree with most comments - difficult but worthwhile because of the explanations. Also an interesting variety of questions. Thanks.