Laughter Between Breakfast And Tea
People speak through me, yet I do not make a sound.
People can sell me, yet I have many clones.
I can bring you laughter between breakfast and tea,
Yet I can also break your heart easily.
I cover the earth like trees of old,
Whose leaves can blind and yet enfold.
A book. Authors can speak to you through a book, yet the book makes no sound. Books are sold and have many duplicate copies. A book can bring the reader to tears and laughter, they span the globe and the leaves of a book (a single sheet in a book is called a leaf) can get you wrapped up in the story that you’re unaware of what’s going on around you.
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.
The More There Is The Less You See
The more there is the less you see. What is it?

Darkness. There more darkness there is, the less you can see.
More You Take Away, The Bigger I Get
The more you take from me, the bigger I get. What am I?
A hole.
This is quite similar to It Cannot Be Seen and Weighs Nothing.
Another 1
What phrase does this represent?
ANOTHER 1
ANOTHER 1
ANOTHER 1
ANOTHER 1
ANOTHER 1
One after another.
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 :)
Cut But Never Eaten
What is put on a table and cut but never eaten?
A deck of cards. You put the cards on the table to play, and you cut the cards to mix them up, but you don’t eat them. Flowers is another possible answer.