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The challenge for Wednesday, September 30, 2026

The four questions from that day on GutGuesser. The answers aren't here: you find them by playing.

1.How long did the longest rainbow on record last?

Nature · Source: Registro de la Universidad Cultural China, 2017

2.How often does your skin renew itself completely?

Human body · Source: Ciclo de renovación epidérmica

3.How many degrees below zero is empty space?

Space · Source: Temperatura del fondo cósmico de microondas

4.How fast does a passenger plane take off?

Transport · Source: Velocidades de rotación típicas en aviación comercial

Think you'd get close?

We don't publish the answers. Every day there are four new questions, one minute, and whoever gets closest wins.

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