A.I. Shlyakhter, Russian physicist. Noted that the existence of the "natural" nuclear reactor at Oklo[?] in Gabon gave evidence that the physical fine-structure constant α has changed less than 10-17 per year over the last two billion years. This idea was picked up and improved upon by Freeman Dyson.
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... are so called because an a, called the theme vowel, is inserted between the stem and the ending. This serves to make the thematic verbs generally more well-behaved. ...