Manacle - definition: a shackle for the hand; handcuff  - today's post is number 410...Whew! I will resist the lure of the obvious link here with a series of particular novels and go another route. Handcuffs have been used for decades and the original design has changed very little. These were used in the trial for Abraham Lincoln's assassination. Circa 1950's handcuffs. These types are more readily recognizable to the majority of us (form movies of course!)  2010 And for the ultra modern with different sizes for men and women and youth and also to denote various cell blocks. As writers we are always researching for facts to ensure our characters and their setting are authentic. Among my list are healing herbs, the wound inflicted from a dagger, barrel racing, reincarnation and cabin building. What is the most unusual fact you have researched?