Echoes of a quartet, multiplied force, a leap from pair to foursome, fourfold strength in a single course.

I'm spoken through problems, some yet to be solved. Through logic and science, I'm always involved. Most everyone knows me, some animals too. I help you determine what's many, what's few.

We are very little creatures; all of us have different features. One of us in glass is set; one of us you'll find in jet. Another you may see in tin, and a fourth is boxed within. If the fifth you should pursue, it can never fly from you. What are we?

I’m born when you look, yet die when you stare. I weigh nothing at all, but crush you with care. I vanish when chased, appear when you flee. I bind every choice yet swear you are free. I’m sharper than truth, more cruel than a lie. I live in the moment you wish would pass by.

I am the cost of every choice you make but I am never the thing you buy