Still thinking of that 1986 experiment by a professor at Shizuoka U who tried breeding mice in cages of wood, concrete, and iron. The mice in the concrete cages just wouldn't breed well, most of the litter died soon after birth, but in the metal cages it was even worse.

https://hell.twtr.plus/media/4911c3e31956c9c631dfd7ca5283728fde03165801dcb2837e2182c4f2c0042b.file

https://hell.twtr.plus/media/d1d239a3f64bc6cb657dabd9f8ae1d75375a8a3a02d7fda4bfb66d7bdd0526a2.file

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