What has changed?

I have a statement for you below.

Hello there! Are you smart enough to solve this question?

Now here is one another sentence

Hello there! Are you smart enough to solve this question?

Can you say what has changed after reading this second sentence

Poetic Riddle

The following verse spells out a word, letter by letter.  "My first" refers to the word's first letter, and so on.  What's the word that this verse describes?

My first is in fish but not in snail
My second in rabbit but not in tail
My third in up but not down
My fourth in tiara not in crown
My fifth in tree you plainly see
My whole a food for you and me

Ans:

Number Puzzle

Assume 9 is twice 5; how will you write 6 times 5 in the same system of notation?

Ans: