Genetics is the study of changes in an organism caused by the activation or deactivation of genes that are passed down to their offspring (without any changes to the organism’s DNA).
The majority of people with cat allergies are not allergic to the actual fur itself, as commonly believed, but to proteins in the cat’s saliva (which just happens to be on cat fur as a result of feline grooming habits), urine, and dander (dried flakes of skin).
Uranium is the heaviest of the primordially occurring elements with an atomic weight of 238.02891.
It’s a widespread misconception that dogs are colorblind. Dogs only have two types of cone photoreceptors (specialized groups of cells in the eye that perceive color), so they don’t see color with the same range and vividness that humans do, but they do see the world in color.