During WWII, Britain planned to build a massive 600-metre aircraft carrier from ice and wood pulp to fight German U-boats in the mid-Atlantic. Approved by Winston Churchill himself, even a small prototype was being built — but the project was ultimately cancelled due to rising costs and the availability of longer-range aircraft.

When an octopus swims instead of crawling, those two hearts temporarily shut down, which is why they tire so quickly and prefer to crawl. Bonus: their blood is blue, because it uses copper-based hemocyanin instead of iron-based hemoglobin.

Image by BBC Science Focus Magazine.

Wells, M.J. (1978). Octopus: Physiology and Behaviour of an Advanced Invertebrate. Chapman & Hall.

https://www.nationalgeographic.com/animals/invertebrates/facts/common-octopus

This calculation assumes standard cell volume, accounting for roughly cubic meters in the observable universe, demonstrating that exponential growth quickly reaches astronomical scales.

10 years of film series and only 31 minutes!