what does the below math rebus puzzle mean?

I speak without a mouth, and hear without ears. I have no-body, but I come alive with the wind. What am I?

Decode below rebus
D
N
A
T
S , D

There are 2 people near the river and both of them want to get on the other side. The boat can only take one of them. But they got across.
How?

What word begins and ends with an E, but has only one letter?

If an earthquake is 1 point higher on the Richter Scale than another earthquake which is actually 10 times stronger, how much stronger would an earthquake be if it was just half a point higher on the Richter scale?

John is on an island and there are three crates of fruit that have washed up in front of him. One crate contains only apples. One crate contains only oranges. The other crate contains both apples and oranges.

Each crate is labelled. One reads 'apples', one reads 'oranges', and one reads 'apples and oranges'. He know that NONE of the crates have been labeled correctly - they are all wrong.

If he can only take out and look at just one of the pieces of fruit from just one of the crates, how can he label all of the crates correctly?

John went to a parrot shop in Mexico, and the parrot owner told him that his parrot is so unique that he repeats everything he hears. John got excited and immediately bought the parrot. John went home and spoke many words, but the parrot does not repeat anything.
He went again to the parrot shop and complaint to the shopkeeper, but the shopkeeper never lied. Explain?

What can go through glass without breaking it?

I have branches, but no fruit, trunk or leaves. What am I?