I Am Worthless
I am worthless, yet when added to others I add worth.
I confounded the ancient Greeks, yet I changed men’s understanding.
What am I?
0 (Zero).
Zero is nothing, yet when you add zeroes to a number like 1, it becomes 10, 100 or 1,000.
The ancient Greeks did not have a name for zero and did not use a placeholder. They seemed unsure about the status of zero as a number, philosophizing about how nothing could be something. Once zero was added, it allowed for more mathematical understanding.
What Has Four Legs and Flies?
What has four legs and flies?
A horse with bugs or two pairs of trousers. The four legs should be obvious and the flies are the zippers.
I Cover What Is Real And Hide What Is True
I cover what is real and hide what is true,
But sometimes I bring out the courage in you.
What am I?
A mask. It makes people look different, but can make you feel more powerful than you normally do.
Makeup also works.
Favorite Pet is a Fish
I died and came back to life. My blood is not easily able to go through my body. My favorite pet is a fish. Who am I?
A shark. Sharks experience tonic immobility, also known as apparent death, where they appear to have died. Blood does not easily flow through their bodies, forcing sharks to swim continuously to circulate their blood. Lastly, sharks have pet fish called Remora (sometimes called suckerfish). They feed on parasites on the sharks and leftovers, and they use the shark as transport and protection.
A big thanks to Saravana for answering this.
I Can Cry Without Eyes
I can cry but I have no eyes.
I can fly but I have no wings.
Wherever I go, darkness follows me.
What am I?
A cloud. Crying is rain, they fly in the sky and darkness follows because they block the sun.
Throw Away Outside, Cook Inside
You throw away the outside and cook the inside. Then you eat the outside and throw away the inside. What did you eat?
An ear of corn.
Words Ending in GRY
Think of words ending in -GRY. Angry and hungry are two of them. There are only three words in the English language. What is the third word? The word is something that everyone uses every day. If you have listened carefully, I have already told you what it is.
The riddle states, “There are only three words in the English language. What is the third word?” The third word of the phrase “the English language” is of course “language.” Don’t get angry at me, I didn’t make it up :)
Tall in Morning, Short at Noon
Tall in the morning, short at noon, gone at night but I’ll be back soon. What am I?
A shadow.