Problem: The net quality of a ground reflection depends on the topography of the surface. When the irregularities of the surface are much smaller than the wavelength, we are in the regime of specular reflection, and the receiver sees both the real antenna and an image of the antenna under the ground due to reflection. But if the ground has irregularities not small compared to the wavelength, reflections will not be coherent but shifted by random phases. With shorter wavelengths (higher frequencies), this is generally the case.
What is the reason for the receiver seeing both the ral antenna and image of the antenna?
The answer is the following: reflection

Problem: An infestation of the coconut rhinoceros beetle (CRB), Oryctes rhinoceros, was detected on Guam on September 12, 2007. CRB is not known to occur in the United States except in American Samoa. Delimiting surveys performed September 1325, 2007 indicated that the infestation was limited to Tumon Bay and Faifai Beach, an area of approximately 900 acres (3.6 km2). Guam Department of Agriculture (GDA) placed quarantine on all properties within the Tumon area on October 5 and later expanded the quarantine to about 2,500 acres (10 km2) on October 25; approximately 0.5 miles (800 m) radius in all directions from all known locations of CRB infestation. CRB is native to Southern Asia and distributed throughout Asia and the Western Pacific including Sri Lanka, Upolu, Samoa, American Samoa, Palau, New Britain, West Irian, New Ireland, Pak Island and Manus Island (New Guinea), Fiji, Cocos (Keeling) Islands, Mauritius, and Reunion.
What other American territory has these beetles that have infested Guam?
The answer is the following: American Samoa

Problem: Since the late 1980s, significant development has occurred in the Bronx, first stimulated by the city's "Ten-Year Housing Plan" and community members working to rebuild the social, economic and environmental infrastructure by creating affordable housing. Groups affiliated with churches in the South Bronx erected the Nehemiah Homes with about 1,000 units. The grass roots organization Nos Quedamos' endeavor known as Melrose Commons began to rebuild areas in the South Bronx. The IRT White Plains Road Line (2 5 trains) began to show an increase in riders. Chains such as Marshalls, Staples, and Target opened stores in the Bronx. More bank branches opened in the Bronx as a whole (rising from 106 in 1997 to 149 in 2007), although not primarily in poor or minority neighborhoods, while the Bronx still has fewer branches per person than other boroughs.
How many bank branches were in the Bronx by 2007?
The answer is the following: 149

Problem: The Great Exhibition was organised by Prince Albert, Henry Cole, Francis Fuller and other members of the Royal Society for the Encouragement of Arts, Manufactures and Commerce. The Great Exhibition made a surplus of 186,000 used in creating an area in the South of Kensington celebrating the encouragement of the arts, industry, and science. Albert insisted the Great Exhibition surplus should be used as a home for culture and education for everyone. His commitment was to find practical solutions to today's social challenges. Prince Albert's vision built the Victoria and Albert Museum, Science Museum, Natural History Museum, Geological Museum, Royal College of Science, Royal College of Art, Royal School of Mines, Royal School of Music, Royal College of Organists, Royal School of Needlework, Royal Geographical Society, Institute of Recorded Sound, Royal Horticultural Gardens, Royal Albert Hall and the Imperial Institute. Royal colleges and the Imperial Institute merged to form what is now Imperial College London.
How much of a surplus did The Great Ehibition raise?
The answer is the following:
186,000