Don ' t tell me you also never heard of remains of christian saints being preserved . <| sep |> You can use truth tables for some . Like the CNOT , which is basically just an XOR with a second input that is just a copy of one of the inputs . For others you need matrices with some complex numbers in . For example , the square root of a NOT is an important gate . It takes 0 to a superposition of 0 and 1 , and 1 to a completely different superposition . <| sep |> I guess they didn ' t get the memo . Edit typo <| sep |> Unless you buy a 1940 ' s rustbucket you don ' t have to worry about a frame just breaking midride . Or wheels . Forks should absolutely be rebuilt on an older bike , but they won ' t just break , they ' ll just really suck . Check the date codes on the tires . That ' s about the only thing I ' d be really worried about . Some of those oldies are running rubber from the 80 ' s . A lot of the older bikes 1970 ' s 80 ' s UJMs for example were overbuilt yet don ' t have the power of today ' s bikes . Even if beaton , they ' re just as safe as newer bikes . Hell , as a newer rider , they may be safer . A CB 600 from 1980 is much less of a beast than say a new CBR 600 . You do have to deal with much worse handlingbreaking . Not as a result of age , rather , just design . Some of the old Kawasaki 2 strokes were known as widowmakers because the technology to make more torque came before the technology to handle that torque . That being said those particular bikes are not cheap as chips so you need not worry about getting those . tldr Perfectly safe , just do proper checks and maintenance . Tires , maybe redo the brake lines and replace the masters if you ' re worried , and see if the forks need a rebuild .