Superboy: Review: Who is Superboy?

A machine that can reveal Superboy’s identity and Lana almost had it down pat. She did at points figure out that Clark was Superboy but there were cracks and Clark’s constant denials and subject-changing. But I think she eventually figured it out when she kissed Clark. Why does Clark want to keep it from Lana so badly. They are literally best friends and the apples of each other’s eye. They’ll get it right, until Lois Lane shows up.