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Researchers believe they have solved [once / one] of science's greatest mysteries. They think they have found [up / out] why a dog's nose is cold. Scientists from universities in Sweden and Hungary have [positioned / posited] that dogs' noses are [constant / constantly] cold because they act as "ultra-sensitive heat [detectors / reflective] ". Canines can sense the temperature of something [previous / before] they touch it. They added that dogs use their noses to [defect / detect] tiny changes in temperature, such as when possible predators or prey are nearby. Humans [generally / uniformly] only know something is hot after touching it, often with painful [consequences / consequential] . It was common belief that the only reason dogs' noses are cold is to control and regulate [their / them] own body temperature.

The researchers conducted experiments [on / in] sixteen dogs that had to detect the temperature of different [subjects / objects] in a room. The objects had different temperatures that humans could [once / only] differentiate by touching them. The scientists said that the brain activity in the dogs [showing / showed] that they could [disdain / discern] which objects were warmer than others. Anna Balint, [lead / leader] author of the study, said: "Dogs are able to [sense / scents] the thermal radiation coming from warm bodies or weak thermal radiation, and they can [chance / change] their behaviour according to this signal." Another scientist said scientists should [knowing / now] re-evaluate how predators hunt. Many may use heat-sensing abilities to track or sense their [prey / pray] .