In practice

In practice, however, the type system constrains the programmer in many ways that are unacceptable to Lisp programmers: data cannot be interpreted as programs, lists must be homogeneous, and functions are not easily redefned without recompiling other dependent functions.

>>25
There is no difference. Lisp code gets macroexpanded into x86 opcodes, which're interpreted by CPU. Even reading this post you interpret it somehow, maybe using some precompiled routines in your brain.