I pulled that number from this article and I am pretty sure I paraphrased it correctly: https://www.scientificamerican.com/article/is-intelligence-hereditary/ h

I pulled that number from this article and I am pretty sure I paraphrased it correctly: https://www.scientificamerican.com/article/is-intelligence-hereditary/ https://www.scientificamerican.com/article/is-intelligence-h... The article may be conflating genetics with other types of biological hereditability, (such as epigenetics?) however I think that is generally pretty common and fine in every lay conversations.