Airplane toilets use an active vacuum instead of a passive siphon. When someone flushes, their waste gets "vacuumed" into a tank.
Fluid mechanics is the branch of physics that studies fluids (liquids, gases, and plasmas) and the forces on them. Fluid mechanics can be divided into fluid statics, the study of fluids at rest; fluid kinematics, the study of fluids in motion; and fluid dynamics, the study of the effect of forces on fluid motion. It is a branch of continuum mechanics, a subject which models matter without using the information that it is made out of atoms, that is, it models matter from a macroscopic viewpoint rather than from a microscopic viewpoint. Fluid mechanics, especially fluid dynamics, is an active field of research with many unsolved or partly solved problems. Fluid mechanics can be mathematically complex, and can best be solved by numerical methods, typically using computers. A modern discipline, called computational fluid dynamics (CFD), is devoted to this approach to solving fluid mechanics problems. Particle image velocimetry, an experimental method for visualizing and analyzing fluid flow, also takes advantage of the highly visual nature of fluid flow.
A public toilet (also called a bathroom, restroom, latrine, comfort room, powder room, toilet room, washroom, water closet, W.C., public lavatory, lav, convenience) is a room or small building containing one or more toilets and possibly also urinals which is available for use by the general public, or in a broader meaning of "public", by customers of other services. Public toilets are commonly separated by gender into male and female facilities, although some can be unisex, particularly the smaller or single occupancy types. Increasingly, public toilets incorporate accessible toilets and features to cater for people with disabilities.
Public toilets may be unattended or be staffed by a janitor (possibly with a separate room), or attendant, provided by the local authority or the owner of the larger building. In many cultures, it is customary to tip the attendant, while other public toilets may charge a small fee for entrance, sometimes through use of a coin operated turnstile. Some venues such as nightclubs may feature a grooming service provided by an attendant in the toilet.
A flush toilet is a toilet that disposes of human waste by using water to flush it through a drainpipe to another location. Flushing mechanisms are found more often on western toilets (used in the sitting position), but many squat toilets also are made for automated flushing. Modern toilets incorporate an "S", "U", "J", or "P" shaped bend that causes the water in the toilet bowl to collect and act as a seal against sewer gases. Since flush toilets are typically not designed to handle waste on site, their drain pipes must be connected to waste conveyance and waste treatment systems. A flush toilet may be euphemistically called a lavatory, a bog (UK), a pot (USA), a loo, a john, a water closet (abbreviated "W.C."), or simply "toilet".
In journalism, a human interest story is a feature story that discusses a person or people in an emotional way. It presents people and their problems, concerns, or achievements in a way that brings about interest, sympathy or motivation in the reader or viewer.
Human interest stories may be "the story behind the story" about an event, organization, or otherwise faceless historical happening, such as about the life of an individual soldier during wartime, an interview with a survivor of a natural disaster, a random act of kindness or profile of someone known for a career achievement.