Show HN: What if the speed of light was 5 km/h? https://bit.ly/4ilrAqo

Show HN: What if the speed of light was 5 km/h? I've always wanted to make a visualization where the speed of light was scaled down to human speeds, so that we could intuit relativistic effects with everyday objects. And here is the first version of it! https://bit.ly/4Ak5Sts September 10, 2026 at 02:58AM