Fun Trivia

I thought I'd try this & see how it goes, over the years most people have "posers"
questions or riddles that can be tricky..... so here goes three of mine....

a) why is red the most popular barn colour?

b) what is Earth's largest satellite?

c) This last one some may think unfair but many Canadians don't get it right...
What American State shares the longest border with Canada?

Lets say 24 hours & then I'll post the answers?

A) red paint is the cheapest
b)The Moon , most people think of manmade ones!
c) Alaska