Abstract: Among other things, systems and methods include a first sensor configured to detect operation of the sink; a second sensor configured to detect personal characteristics of a person operating the sink.

Abstract: Among other things, systems and methods include a first sensor configured to detect operation of the sink; a second sensor configured to detect personal characteristics of a person operating the sink.

Abstract: Among other things, systems to encourage compliance with hand washing procedures can include: an infrared emitter that projects a first infrared beam with a transverse cross-section having a first axis and a second axis that is shorter than the first axis, the transverse cross-section having a maximum length along the first axis, the infrared emitter modulating the first infrared beam to transmit a first identification signal; wherein the infrared emitter projecting the first infrared beam is placed such that the first axis of the transverse cross-section of the first infrared beam is substantially parallel to a boundary.

Abstract: Among other things, systems and methods include a first sensor configured to detect operation of the sink; a second sensor configured to detect personal characteristics of a person operating the sink.

Abstract: Among other things, systems to encourage compliance with hand washing procedures can include: an infrared emitter that projects a first infrared beam with a transverse cross-section having a first axis and a second axis that is shorter than the first axis, the transverse cross-section having a maximum length along the first axis, the infrared emitter modulating the first infrared beam to transmit a first identification signal; wherein the infrared emitter projecting the first infrared beam is placed such that the first axis of the transverse cross-section of the first infrared beam is substantially parallel to a boundary.

Abstract: Among other things, an entry monitor has circuitry to detect when a person enters a monitored space and an indicator perceptible to other people in the space to indicate a cleanliness state of the hands of the person who has entered the space.

Abstract: Among other things, systems and methods include an apparatus to be carried or worn by a person, the apparatus comprising: electronics to determine a cleanliness state of the person's hands; and an element separate from the electronics to communicate information associated with the person to the electronics.