You can throw me away, but I will always be coming back. What am I?

Answer: Boomerang

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More What am I ?

You cannot keep me until you have given me. What am I?
You carry me everywhere, even at night and I can also be a flashlight. What am I?
You do not want me when you don’t have me, but when you have me you don’t want to lose me.
You get embarrassed when you stand on me when everybody is watching. Women don’t like to talk about the number they see on me. Everyone stands on me when nobody is around. What am I?
You heard me before, and then again. Afterward I die, until you call me again. What am I?
You hold my tail while I fish for you. What am I?
You may always chase me but you are always about 3 miles away. What am I?
You may enter, but you may not come in, I have space, but no room, I have keys, but open no lock. What am I?
You may have many of me but never enough. After the last one arrives you will have no more. What am I?
You measure my life in hours and I serve you by expiring. I’m quick when I’m thin and slow when I’m fat. The wind is my enemy.
You need thousands of me to create a digital image. What am I?
You put me on a table and cut me, but you don't eat me. What am I?