Context: 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.

Question: What color silk covered Bell's kites?
Answer: maroon

Question: Who was on Cygnet I when it crashed?
Answer: Selfridge

Question: Bell's kits were flown from 1907 to what year?
Answer: 1912

Question: How many tetrahedral wings did Bell create?
Answer: 3

Question: Some of the kites remain at what National Historic Site?
Answer: Alexander Graham Bell