What is the fewest number of coins that would be required in order to make sure each and every coin touches exactly three other coins?

What does below Rebus mean ?

esgg sgeg gegs gsge

What has one eye, but can’t see?

What always comes into a house through the keyhole?

Can you count the number of lines in the below picture?

Can you find the missing piece of the Porsche?

What does this Rebus Picture mean?

A father's child, a mother's child, yet no one's son.

Who am I?

A King wants to send the diamond ring to his girlfriend securely. He got multiple locks and their corresponding keys. His girlfriend does not have any keys to these locks and if he sends the key without a lock, the key can be copied in the way. How can King send the ring to his girlfriend securely?

He runs but never walks. Murmurs, but never talks. Has a bed, but never sleeps. And has a mouth, but never eats?