Do you know what is the hardest part of learning to ride a bike?
Interesting Fact: There are several early but unverified claims for the invention of bicycle-like machines. The earliest comes from a sketch said to be from 1493 and attributed to Gian Giacomo Caprotti, a pupil of Leonardo da Vinci. In 1998 Hans-Erhard Lessing described this as a purposeful fraud. However, the authenticity of the bicycle sketch is still vigorously maintained by followers of Prof. Augusto Marinoni, a lexicographer and philologist, who was entrusted by the Commissione Vinciana of Rome with the transcription of da Vinci’s Codex Atlanticus. ( https://en.wikipedia.org/wiki/History_of_the_bicycle )
Interesting Fact: Throughout the 14th and 15th centuries, most European frames were church-commissioned and largely unmovable as they were altarpieces and a large part of the church’s architecture. The frames were ornamented with architectural elements mimicking the exteriors of the great cathedrals. ( http://en.m.wikipedia.org/wiki/Picture_frame#History )