There is strong systematic evidence that the whole larynx is lower during the production of voiced stops relative to voiceless aspirated stops intervocalically in English (Ewan and Krones, 1972). Using a device called the Thyroumbrometer, which measures vertical displacement of the laryngeal prominence to within 2 mm and horizontal displacement qualitatively, we now have similar evidence for French, Thai, Mandarin, Igbo, Japanese, Taiwanese, and other languages. A low larynx is associated with a lowF0and a high larynx with a highF0ceteris paribus (Ohala and Ewan, 1972). Even though there is noF0in voiceless aspirates, this correlation between larynx height andF0leads me to speculate on a possible articulatory universal for plain stops and larynx height, and on possible relations between larynx height and sound change. There are many documented cases in Asian languages (Wang and Matisoff, personal communication) in which the merger of initial stops was related to tone change, e.g., pH → pV́ and b → pV̀. Apparently the relative difference in the positioning of the larynx forms a predisposition along with intrinsic factors which make such change possible.