The brain's speech area, named after 19th century French physician Pierre Paul Broca, shuts down when we talk out loud, according to a new study that challenges the long-held assumption that 'Broca's area' governs all aspects of speech production. 
Most things are said in silence.
Every time you speak you (literally and metaphorically) stop talking.
Sit under the tree.
Let the sun burn you. Even the greatest philosopher sounds stupid next to the silent breeze…
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