Question: Roads in the US have been paved with materials that include asphalt/bitumen since at least 1870, when a street in front of the Newark, NJ City Hall was paved. In many cases, these early pavings were made from naturally occurring "bituminous rock", such as at Ritchie Mines in Macfarlan in Ritchie County, West Virginia from 1852 to 1873. In 1876, asphalt-based paving was used to pave Pennsylvania Avenue in Washington, DC, in time for the celebration of the national centennial. Asphalt/bitumen was also used for flooring, paving and waterproofing of baths and swimming pools during the early 20th century, following similar trends in Europe.
Is there an answer to this question: When was New York's, Pennsylvania Avenue paved?

Answer: unanswerable


Question: In 1981, The Times and The Sunday Times were bought from Thomson by Rupert Murdoch's News International. The acquisition followed three weeks of intensive bargaining with the unions by company negotiators, John Collier and Bill O'Neill.
Is there an answer to this question: Who owned the major corporation that bought The Times in 1981?

Answer: Rupert Murdoch


Question: Videoconferencing is a highly useful technology for real-time telemedicine and telenursing applications, such as diagnosis, consulting, transmission of medical images, etc... With videoconferencing, patients may contact nurses and physicians in emergency or routine situations; physicians and other paramedical professionals can discuss cases across large distances. Rural areas can use this technology for diagnostic purposes, thus saving lives and making more efficient use of health care money. For example, a rural medical center in Ohio, United States, used videoconferencing to successfully cut the number of transfers of sick infants to a hospital 70 miles (110 km) away. This had previously cost nearly $10,000 per transfer.
Is there an answer to this question: Where did a medical center use transmission of medical images to cut costs?

Answer: unanswerable


Question: Population testing is still being done. Some Native American groups that have been sampled may not have shared the pattern of markers being searched for. Geneticists acknowledge that DNA testing cannot yet distinguish among members of differing cultural Native American nations. There is genetic evidence for three major migrations into North America, but not for more recent historic differentiation. In addition, not all Native Americans have been tested, so scientists do not know for sure that Native Americans have only the genetic markers they have identified.
Is there an answer to this question: What can DNA testing distinguish between?

Answer:
unanswerable