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

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Number Puzzle

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

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Two Trains

One train runs from A to B at 105 miles per hour, the other runs from B to A at 85 miles per hour.  How far apart were the two trains 30 minutes prior to their crossing?

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The Three Cards

There are three playing cards lying face up, side by side.  A five is just to the right of a two.  A five is just to the left of a two.  A spade is just to the left of a club, and a spade is just to the right of a spade. 

What are the three cards?

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Shocks and Shoes

You are in the dark, and on the floor there are six shoes of three colors, and a heap of twenty-four socks, black and brown.  How many socks and shoes (at most) must you take into the light to be certain that you have a matching pair of socks and a matching pair of shoes?

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Liar Paradox

There was an outlaw in a small town in the old west that was sentenced to death for a series of crimes. The sheriff of the old town offered the outlaw a choice of method of execution based on the outlaw's last words.

"If you tell a truthful statement, you will be electrocuted. Otherwise, you will be hanged," said the sheriff.

A few days passed, and it was the day of the scheduled execution. The townspeople gathered around the square, waiting to hear the outlaw's last words, as they would decide his method of execution.
After he said his last words, he was not given death sentence. What did he said?

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Water lily

In the middle of a round pool lies a beautiful water lily. The water lily doubles in size every day. After exactly 20 days, the lily will cover the complete pool.
After how many days will the water lily cover half of the pool?



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