Home 24h Top Newest Best Ask Show Jobs

TechEcho

A tech news platform built with Next.js, providing global tech news and discussions.

Home

Home Newest Best Ask Show Jobs

Resources

HackerNews API Original HackerNews Next.js

© 2025 TechEcho. All rights reserved.

Why do mirrors flip left-and-right but not up-and-down?

2 pointsby klochabout 2 years ago

1 comment

HelloNurseabout 2 years ago

An excellent test question for introductory physics students.