Maple trees should be at least 30+ years old before they are tapped and a 40-year-old sugar maple tree will produce about 10 gallons of sap per season.
Black cats are black because of high levels of eumelanin pigment, and the gene that produces it is dominant. A kitten only needs one black gene from a parent to have a black coat.
Selfies may increase social sensitivity.
One study found that taking and sharing selfies was associated with a higher level of social sensitivity, meaning people become more attuned to social cues (like how others perceive them)
