They have been built since the mid 1800's. Perhaps we can present some facts in an FAQ form. The word recumbent refers to the low-seated position. They usually have two wheels although some have three. They are very comfortable.
Recumbent seats are large and usually with a very comfortable backrest.
You aren't perched on top of a narrow saddle which can tend to cause numbness and chafing, to say nothing of the effect a conventional bike saddle can have on the male prostate. The handlebars are either above the seat at about shoulder level or below the seat at a position where your arms hang down naturally. Either of these positions gives a comfortable ride making long distance riding free from neck strain, saddle sores, wrist pain and numbness. It might take a little bit of time to get used to the feel and handling of the bike. It is so low that when you are learning, you can at any time just put both feet down and stop.