This is a heavily interactive web application, and JavaScript is required. Simple HTML interfaces are possible, but that is not what this is.
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Fun Fact Science with Kovi
funfactscience.com
did:plc:g2owon5fxl4ctqzz7iimkbg6
This got genuinely difficult towards the end and definitely made me realise how dirty my laptop screen is
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What's My JND? 0.0040
Can you beat it?
https://www.keithcirkel.co.uk/whats-my-jnd/?r=AZMhKP__-dv4
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2026-03-12T05:39:38.395Z