Home » + English • Phrases » “Everything is theoretically impossible, until it is done.” Robert A. Heinlein “Everything is theoretically impossible, until it is done.” Robert A. Heinlein By Andres Trevino April 8, 2023 + English Phrases No comments Tweet Pin It “Everything is theoretically impossible, until it is done.”– Robert A. Heinlein Related Posts Tracy & Rich McLeish – Our heartfelt sympathy Penelope robot Dr. Leslie Lehman – Attending Physician