Hacker News on 7 December 2021

• AWS us-east-1 outage
• Issues with Cloudflare Images
• How a Kalman filter works, in pictures
• Django 4.0
• NASA returns Hubble to full science operations
• Hetzner now provides IPv6 only dedicated servers
• How to run a small social network site for your friends
• Rockstar: a language for programs that are also hair metal power ballads
• Numerics applied to Casimir geometry generates intersection with Alcubierre warp
• Miniature 3456 LED Cube