Riddles

I put HIJKLMNO into a cup. What is in there?
ABCDEFG. When I see E, I am nervous. When it says F, I am much relieved. What is it?
6+3 = 9, but 9+6 = 3. What am I looking at?
Add one straight line to the following and make it true
5 + 5 + 5 = 550
- (and the answer is NOT to put a line through the equal sign).
- There are actually two different places you can put a line and make this correct.
Here’s a game you can play with match sticks or toothpicks:

Move two sticks and turn the five squares into four.

If it takes five machines five minutes to make five widgets, how long does it take 100 machines to make 100 widgets?
There is a pond. One day a lilly pad appears in the middle of the pond. Each day there are more liliy pads, twice the area of the previous day. On Day #48 the entire pond is filled with lily pads for the first time. How many days did it take for the pond to be half-filled with lily pads?
Here’s an ancient riddle:
What is greater than God…
Worse than the Devit…
Dead men eat it…
But if you ate it, you would die.
Here’s an easy riddle for ‘beginners’….
I have hands but no feet.
I run but I cannot walk
I have a face but no eyes.
I tell you something but I cannot speak
I raed seehmorwe taht any seecnnte, wehre the fsrit and lsat leertts of ecah wrod are
mtnniieaad, but all the lttrees in bweeetn are jbelmud up, is slitl ceellmopty raalbdee. Is
tihs ture?
- I can only imagine how the human brain, with its “fuzzy logic”, reassembles an
  incoherent presentation into one with actual meaning. Clearly our brain sees
  patterns, not just letters or words.