Simple English Simple English Simple English Theodor Schwann Simple English Simple English Simple English Simple English Simple English Simple English Wikipedia - http://simple.wikipedia.org/wiki/Theodor_Schwann Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English