If you drop me I’m sure to crack but give me a smile and i’ll always smile back. What am i?

Answer: Mirror

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More What am I ?

If you eat me, my sender will eat you. What am I?
If you have me, you want to share me. Once you share me, you won’t have me. What am I?
If you have three, you have three. If you have two, you have two. But if you have one, you have none. What am I?
If you held me for too long, you would die. What am I?
If you look you cannot see me. And if you see me you cannot see anything else. I can make anything you want happen, but later everything goes back to normal. What am I?
If you lose me you may cause people around me to lose me too. What am I?
If you throw me out the window, I'll leave a grieving wife. Bring me back, but through the door, You'll see someone giving life. What am I?
In a tree you'll find me moving slow as can be. My name is a sin but from them I am free. What am I?
In my life I must bare, my bloodline I must share. What am I?
In prison I will be found, But I’ll never be in court, Unless there’s more than one. What am I?
In the ground I am nothing, but give me time and I'll be something. What am I?
In the light, I may reflect. In the dark, I'm cold and wet. What am I?