Here's something else that you could find in the Seventies that is forbidden nowadays: an open minded documentary on the paranormal and its relationship to mainstream science, featuring respected scientists, and broadcast during peak time.
Nowadays this kind of subject matter is basically forbidden on the tamely materialist BBC. The likes of Channel 4 will occasionally investigate it, but only to pooh-pooh it with a familiar array of sceptics.
And so what appeared at the time to be a new frontier of knowledge has effectively been closed off, and we're stuck with materialism whether it offers any answers or not.
Not that this matters in the long run, as one of the major casualties of the perilous economic decline of the Western world will be scientific progress itself. What we don't know now, we will never know, as the capital to hollow out more and more Swiss mountains to chase ever more elusive phantom particles simply won't be available.