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The Availability Heuristic01:08

The Availability Heuristic

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The hazard rate, also known as the hazard function or failure rate, is a statistical measure used to describe the instantaneous rate at which an event occurs, given that the event has not yet happened. From a probabilistic perspective, it represents the likelihood that a subject will experience the event in a very small time interval, conditional on surviving up to the beginning of that interval. In terms of frequency, the hazard rate can be viewed as the ratio of the number of events to the...
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In fluid mechanics, buoyancy and stability are key concepts for understanding the behavior of submerged and floating bodies. When a stationary body is fully or partially submerged in a fluid, the fluid exerts a force on the body known as the buoyant force. This force acts vertically upward through a point called the center of buoyancy, which is the center of the displaced fluid volume. According to Archimedes' principle, the magnitude of the buoyant force is equal to the weight of the fluid...
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Related Experiment Video

Updated: May 21, 2026

Training Rats to Voluntarily Dive Underwater: Investigations of the Mammalian Diving Response
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Training Rats to Voluntarily Dive Underwater: Investigations of the Mammalian Diving Response

Published on: November 12, 2014

Accident rates at a busy diving centre.

Michael Davis1, Kate Malcolm

  • 1Christchurch Hospital, Christchurch, New Zealand,

Diving and Hyperbaric Medicine
|June 14, 2012
PubMed
Summary

Scuba diving in New Zealand

Area of Science:

  • Marine biology
  • Diving medicine
  • Tourism safety

Background:

  • Dive! Tutukaka, a major operator in New Zealand's Poor Knights Islands, provided data on over 32,000 divers and 70,000 dives.
  • Injury data were collected over three financial years (2005-2008) for both customers and divemasters.

Discussion:

  • The study documented seven cases of decompression illness (DCI), a rate of approximately 1 per 10,000 divers.
  • Minor diving injuries occurred at a rate of 2 per 10,000 divers.
  • Non-diving injuries, primarily musculoskeletal among staff, were also recorded.

Key Insights:

  • Diving in this popular temperate-water destination shows a low incidence of serious injury.
  • Decompression illness (DCI) affected 1 in 10,000 divers, with two cases resulting in neurological injury.

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  • Musculoskeletal injuries highlight potential areas for improved safety practices for dive staff.

    • Outlook:

    • Further research could explore specific risk factors for DCI in this environment.
    • Implementing improved manual handling techniques for dive equipment could reduce staff injuries.
    • Continued monitoring of diving safety data is essential for this international tourism hub.