Teórico, pragmático, experimental...‏

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Theoretician:

                     There is nothing 

more practical than a good theory.

Practical person:

                          In theory, 

there should be no difference 

between theory and practice,

but in practice, there is.

Experimentalist:

Theory is when you know everything but nothing works.

Practice is when everything works but no one knows why.

In our laboratory, theory and practice are combined:

nothing works and no one knows why.