Lucas Jackson / Reuters
Back in the 1970s as a vice-principal of a local high school, a grade nine student registered as "male" informed me he was now "female." The gender spectrum at that time was largely an official mystery. She, requested the use of the girl's washroom and I made arrangements to have her use the female staff washroom.
Mittens is a seemingly regular household cat that enjoys being scratched under the chin and chasing string around, but there's one thing about a Newfoundland family's pet that sets it apart...
The classic definition of a biological species is the ability to breed within its group, and the inability to breed outside it. A study published July 29 in the journal PLOS Biology offers some important clues about the evolution of barriers to breeding.