Simple riddles

I create my lair with earthen string and dispatch my prey with a biting sting. What am I?

Five add six is eleven, but six add seven is one. How is that possible?

How far can you run into the woods?

As small as your thumb, I am light in the air. You may hear me before you see me, but trust that I'm there. What am I?

If 20 blackbirds are on a fence and you shoot one, how many remain?

What has six faces, but does not wear makeup. It also has twenty-one eyes, but cannot see?

Two men are in a desert. They're both wearing backpacks. One of the men is dead. The man who is alive, has his pack open. The dead man's pack is closed. What is in their packs?

What is it that you throw away the outer side, then cook the insides and then throw away the insides – what is the name of the item?

One company had two factories, in different parts of the country, that were making the same style of shoes. In both factories, workers were stealing shoes. How, without using any security, could that company stop the stealing?

Create a number using only the digits 4,4,3,3,2,2,1 and 1. So I can only be eight digits. You have to make sure the ones are separated by one digit, the twos are separated by two digits the threes are separated with three digits and the fours are separated by four digits.