Many people might have an experience to lose a key when they have dropped it on the ground. Then, they can`t find the key sometimes even if they look carefully for the direction which it gone.
We supposed this lost is caused by the warp of a key. Based app on this assumption, we investigated the distribution and the direction of a key when it dropped to confirm whether the key actually do wrap or not. Through this experiments, we could find that the key tend to be dropped left side.