In 2001: A Space Odyssey, there is a scene where two astronauts go into a soundproof space capsule so the computer system HAL cannot hear them. It is shown that HAL is listening to them by watching their lips through the window. Is it really possible to lip read to that degree of accuracy? To my limited understanding, many words in English have the same lip motion. Also in the scene, only the side of the mouth is shown (no tongue) which would make it harder.
closed as off-topic by Daniel Roseman, Edlothiad, phantom42, Valorum, NKCampbell Jan 30 '18 at 14:25
This question appears to be off-topic. The users who voted to close gave this specific reason:
- "Questions seeking scientific solutions or explanations are off-topic unless related directly to a cited work of fiction. There are several other Stack Exchange sites dedicated to answering questions on non-fictional sciences. For more information, see What is our actual policy on science questions? on meta." – Daniel Roseman, Edlothiad, Valorum, NKCampbell