Question: In nature, the red color of blood comes from hemoglobin, the iron-containing protein found in the red blood cells of all vertebrates. The red color of the Grand Canyon and other geological features is caused by hematite or red ochre, both forms of iron oxide. It also causes the red color of the planet Mars. The red sky at sunset and sunrise is caused by an optical effect known as Rayleigh scattering, which, when the sun is low or below the horizon, increases the red-wavelength light that reaches the eye. The color of autumn leaves is caused by pigments called anthocyanins, which are produced towards the end of summer, when the green chlorophyll is no longer produced. One to two percent of the human population has red hair; the color is produced by high levels of the reddish pigment pheomelanin (which also accounts for the red color of the lips) and relatively low levels of the dark pigment eumelanin.
Is there an answer to this question: Where does hemoglobin come from?

Answer: unanswerable

Question: Following his ascension to power, Gaddafi moved into the Bab al-Azizia barracks, a six-mile long fortified compound located two miles from the center of Tripoli. His home and office at Azizia was a bunker designed by West German engineers, while the rest of his family lived in a large two-story building. Within the compound were also two tennis courts, a soccer field, several gardens, camels, and a Bedouin tent in which he entertained guests. In the 1980s, his lifestyle was considered modest in comparison to those of many other Arab leaders. Gaddafi allegedly worked for years with Swiss banks to launder international banking transactions. In November 2011, The Sunday Times identified property worth 1 billion in the UK that Gaddafi allegedly owned. Gaddafi had an Airbus A340 private jet, which he bought from Prince Al-Waleed bin Talal of Saudi Arabia for $120 million in 2003. Operated by Tripoli-based Afriqiyah Airways and decorated externally in their colours, it had various luxuries including a jacuzzi.
Is there an answer to this question: Who designed Gaddafi's Azizia home?

Answer: West German engineers

Question: London i/lndn/ is the capital and most populous city of England and the United Kingdom. Standing on the River Thames in the south eastern part of the island of Great Britain, London has been a major settlement for two millennia. It was founded by the Romans, who named it Londinium. London's ancient core, the City of London, largely retains its 1.12-square-mile (2.9 km2) medieval boundaries and in 2011 had a resident population of 7,375, making it the smallest city in England. Since at least the 19th century, the term London has also referred to the metropolis developed around this core. The bulk of this conurbation forms Greater London,[note 1] a region of England governed by the Mayor of London and the London Assembly.[note 2] The conurbation also covers two English counties: the small district of the City of London and the county of Greater London. The latter constitutes the vast majority of London, though historically it was split between Middlesex (a now abolished county), Essex, Surrey, Kent and Hertfordshire.
Is there an answer to this question: What is the approximate area of the core of the City of London?

Answer: 1.12-square-mile (2.9 km2)

Question: One example of omnidirectional antennas is the very common vertical antenna or whip antenna consisting of a metal rod (often, but not always, a quarter of a wavelength long). A dipole antenna is similar but consists of two such conductors extending in opposite directions, with a total length that is often, but not always, a half of a wavelength long. Dipoles are typically oriented horizontally in which case they are weakly directional: signals are reasonably well radiated toward or received from all directions with the exception of the direction along the conductor itself; this region is called the antenna blind cone or null.
Is there an answer to this question: What type of antenna would most likely be a half a wavelength long?

Answer:
dipole