Show HN: Website to test if you can detect someone staring at your back (sixthsense.fastmathfacts.io)

Hey, I'm a biology professor. This is part of an class activity I'm doing about experimental design and evidence interpretation.

We've all felt that sensation, that itch on the back of our neck, that we're being watched.

This silly site takes that question seriously and lets people test it directly with their friends.