at a distance of two feet
41measurement system — Introduction any of the systems used in the process of associating numbers with physical quantities and phenomena (metrology). Although the concept of weights and measures (measurement) today includes such factors as temperature, luminosity …
42Western architecture — Introduction history of Western architecture from prehistoric Mediterranean cultures to the present. The history of Western architecture is marked by a series of new solutions to structural problems. During the period from the… …
43Wireless energy transfer — or wireless power is the transmission of electrical energy from a power source to an electrical load without artificial interconnecting conductors. Wireless transmission is useful in cases where interconnecting wires are inconvenient, hazardous,… …
44Baseball park — A baseball park, baseball stadium, or ball park / ballpark is the field of play in the game of baseball and the spectator seating areas (if any) and any other features connected with it.The flexible rules about baseball fields (aside from the… …
45Witness accounts of the Roswell UFO incident — Follows are excerpts of witness accounts of the Roswell UFO incident.In 1978, author Stanton T. Friedman interviewed Jesse Marcel, who voiced his suspicion that debris he recovered on a ranch near Roswell in 1947 was not of this world. Over the… …
46radio — /ray dee oh /, n., pl. radios, adj., v., radioed, radioing. n. 1. wireless telegraphy or telephony: speeches broadcast by radio. 2. an apparatus for receiving or transmitting radio broadcasts. 3. a message transmitted by radio. adj. 4. pertaining …
47Comparison of Canadian and American football — Canadian and American football are very similar, as both have their origins in rugby. As such, the rules of these sports are very similar, although a comparison illustrates some key differences.HistoryFootball was introduced to North America in… …
48Softball — This article is about the sport. For other uses, see Soft ball (disambiguation). Softball Highest governing body International Softball Federation First played United States, 1887 Characteristics …
49Lock (water transport) — Canal lock and lock keeper s cottage on the Aylesbury Arm of the Grand Union Canal at Marsworth in Hertfordshire, England …
50Diffusion of technology in Canada — This article outlines the history of the diffusion or spread of technology in Canada. Technologies chosen for treatment here include, in rough order, transportation, communication, energy, materials, industry, public works, public services… …
