In 1898, Bell experimented with tetrahedral box kites and wings constructed of multiple compound tetrahedral kites covered in maroon silk.[N 23] The tetrahedral wings were named Cygnet I, II and III, and were flown both unmanned and manned (Cygnet I crashed during a flight carrying Selfridge) in the period from 1907–1912. Some of Bell's kites are on display at the Alexander Graham Bell National Historic Site.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What color silk covered Bell's kites?
Ah, so.. maroon

The 2015 Human Development Report by the United Nations Development Program was released on December 14, 2015, and calculates HDI values based on estimates for 2014. Below is the list of the "very high human development" countries:
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Which year was used for estimates in the 2015 report?
Ah, so.. 2014

Early writings on the subject tended to judge states by the realist criterion, as expressed by the historian A. J. P. Taylor when he noted that "The test of a great power is the test of strength for war." Later writers have expanded this test, attempting to define power in terms of overall military, economic, and political capacity. Kenneth Waltz, the founder of the neorealist theory of international relations, uses a set of five criteria to determine great power: population and territory; resource endowment; economic capability; political stability and competence; and military strength. These expanded criteria can be divided into three heads: power capabilities, spatial aspects, and status.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Who wrote, "The test of a great power is the test of strength for war."?
Ah, so..
A. J. P. Taylor