Three links (OK, four) on teaching math

I came across this NPR post today via a post on Facebook. This led me to remember this one and that one, from a recent post and an older post I made myself on FB. The last one of these three links leads to a great discussion of how becoming good at math is a path open to everyone, but it takes hard work. Older people in a position to advise / teach younger ones should be keenly aware of the last one, and help their students/children/tutees adopt a growth mindset.