How many spoken languages are there? How long have languages existed? Which language was the first one ever written? Which language has the most sounds? Which alphabet has the fewest letters? More ...
P. Xia, S. Wu, and B. Van Durme. Proceedings of the 2020 Conference on Empirical Methods in Natural Language Processing (EMNLP), page 7516--7533. Association for Computational Linguistics, (November 2020)