Why aren't we using the Gold Standard anymore?

We were discussing it in my history class and I was just asking this to myself.

Because if we printed more and more money, like what a waste of paper.

And then I asked myself, What if we use like half and half of each? We'll split the amount of dollar bills and gold that we make to make our regular purchases.

I think it might work...But I mean, I guess it would depend on the country.

What are your thoughts?

Cheers!