Twenty divers went into the sea after a few hours twenty four heads popped up. How is this possible?

Stars left on the skin after the sun’s gentle kiss.

Tonight I stay, tomorrow I laugh elsewhere. Once I swear I’ll leave, I never do. When the crowds thin, I perform anyway. Names change, streets don’t follow. Tell me, what keeps me talking?

I begin in warmth ,I help you grow, I’m not water yet I pour . I’m not chalk , yet I’m white for sure . I come from source that moos or cares .Who am I?

What weighs nothing, cost nothing one person can't own but two people can share, and lasts a lifetime.