As for the ordinary, non-ray lunar craters, these features are not at all volcanic craters in the usual sense. One of the few good things to come out of World War II was the first satisfactory explanation of the “run-of-the-mill” craters on the moon. Jeremi Wasiutynski, a brilliant Polish scientist forced to take refuge in Norway, sought to explain these craters as originating in _convection_ processes. While the term “convection” may not be familiar, the role convection plays in filling the sky with beautiful clouds on a hot summer’s day is well known. Such cloud formation results from convection in the gaseous free atmosphere. Much more remarkable and regular are the results of _controlled_ convection in layers of _liquids_ rather than gases. Laboratory investigation of the effects produced by convection processes in heated liquids formed the basis for Wasiutynski’s new theory. According to this theory, convection processes in the only partially solidified outer shell of the youthful moon could have given rise to great numbers of surface features having the size, shape, and distribution of the common lunar craters. In far more satisfactory fashion than any other theory so far proposed, the convection-current hypothesis of Wasiutynski explains the many and distinctive characteristics of the non-ray craters on the moon. RECOGNIZED METEORITE CRATERS OF THE WORLD NAME LOCATION DATE OF RECOGNITION Canyon Diablo Coconino County, Arizona 1905 Odessa Ector County, Texas 1929 Henbury McDonnell Ranges, Central 1932 Australia Wabar Rub’ al Khali, Arabia 1932 Campo del Cielo Gran Chaco, Argentina 1933 [2]Haviland (Brenham) Kiowa County, Kansas 1933 Mount Darwin Tasmania 1933 [3]Podkamennaya Tunguska Yeniseisk District, Siberia 1933 Box Hole Station Plenty River, Central 1937 Australia Kaalijarv Oesel, Estonia 1937 Dalgaranga Western Australia 1938 Ussuri (Sikhote-Alin) Eastern Siberia 1947 Wolf Creek Wyndham, Kimberley, 1948 Western Australia Aouelloul Adrar, Western Sahara 1952 5. HEAVEN KNOWS WHERE OR WHEN