Non-human animals have culture, and that culture can accumulate and grow even in animals we consider simple, so there has to be something else that sets our culture apart.
For fifty years, solar and wind power have been promoted or mocked together – but now one looks set to dominate electricity production, while the other is growing much more slowly.
Calcea Johnson and Ne'Kiya Jackson have added four further novel proofs of the theorem that had also not been published before, and left clues for another five.