The Italian mathematician Leonardo Bonacci, who was called Fibonacci, introduced the Hindu-Arabic numeral system to Europe.

Remember when we could see the mountain's peak? The sparkle off the amphibole.

Generally these undulations are less than 1 meter long. Van Straaten (1953, p. 1—2) used the term megaripple for ripple marks with wave lengths (fig. 4-13) greater than 1 meter.

Major Peter had the qualities making for a great leader of a Fighter Squadron, utter sincerity of purpose, high personal courage, and those general attributes of air-leadership consolidated in the pilot’s word, “cluefulness”