Born from a shell, Yet smoother than it seems. I make plain bread smile, Creating a lunchtime dream. What am I?

When the only way forward is up. Ladders, ropes, and mountains are all friends of mine.

I foam up when you rub my head, I wash away what oily threads led. I come in bottles, clear or brightly hued, And leave your scalp completely renewed.

Whether weighing peaches, people, or the choices that we make, I’m trusted with the answer, however much’s at stake.

Dances without legs, leaps without feet Breaks through the dark and gives off heat Feed and it will grow, but it'll die if you blow