An approximately 14,200 year old grave site uncovered in Germany in 1914 is the earliest evidence we have of the domestication of dogs. The site had two humans along with the body of a puppy; researchers not only identified the puppy skeleton as that of a domesticated canine species, but evidence at the site suggested it had received direct care from humans.

The vast majority of people (96 percent in the surveyed group) can detect the difference between hot and cold water based on the sound it makes when poured. The key is how the temperature affects the viscosity of the liquid: cold water splashing into a cup generates lower frequency sounds and hot water generates higher frequency sounds.