Hacker News on 24 September 2020

• Epic, Spotify, and Tinder form advocacy group to push for app store changes
• Crows possess higher intelligence long thought a primarily human attribute
• $1 hearing aid could treat millions with hearing loss
• Mathematics for Programmers [pdf]
• PostgreSQL 13
• Work on What Matters
• Australia to produce seaweed cattle feed that reduces methane emissions by 80%
• An update to the Timescale license
• Assange Hearing Day 16
• Escaping the Dark Forest