Abstract: Among other things, a computer-implemented method includes, on successive occasions over a period of time, gathering measured data and self-reported data that represent health states of participants in a health goal system, based on at least some of the gathered data, determining, by machine learning, data representing a relationship between sequences of self-applied interventions and health states of participants who belong to respective groups that share similar characteristics, calculating scores representing characteristics of interactions between participants and the health goal system, and based on the scores and the data determined by machine learning, choosing elements of conversations to be provided to the participants, elements of the conversations being chosen to affect (i) behaviors, (ii) health states, or (iii) health awareness, or a combination of any two or more of them, of the participants, the elements of the conversations comprising questions posed to the participants on user interfaces of e

Abstract: Among other things, a method includes, on successive occasions over a period of time, gathering measured data and self-reported data that represent a health state of a particular participant in a health goal system, using the gathered data in a machine learning engine to select, for a current occasion, a current intervention to be self-applied by the particular participant, the machine learning engine having learned from data gathered from a group of participants on successive occasions, the effectiveness of sequences of self-applied interventions in improving the health states of participants who belong to respective groups that share similar characteristics, the current intervention being expected to affect, for the particular participant (i) a behavior, (ii) the health state, or (iii) a health awareness, and providing the particular participant, electronically through a user interface, information that will encourage the particular participant to engage in the selected self-applied current intervention.

Abstract: A torque-override cap is provided for use in a filler neck of a tank. The cap includes a housing configured to engage the filler neck, a shell for providing a hand grip, and a ratchet wheel and a biasing mechanism disposed between the shell and the housing for providing a driving connection between the shell and the housing. The shell includes a plurality of drive teeth, while the ratchet wheel includes a plurality of driven teeth configured to engage the drive teeth to provide a torque-limited connection in the cap-advancing direction and a positive connection in the cap-removal direction. The biasing mechanism operates to yieldably bias the driven teeth of the ratchet wheel into engagement with the drive teeth of the shell to establish the torque-limited and positive connections.