Rocks are literally brighter than that person :p

Those are things that regulate the tension in the overhead cables on train tracks. With the variation of temperature cables tend to contract/expand and this systems allows the cables to do so freely with a constant tension provided by the weights.

They just found rocks that are naturally hot and boiled water with it… Engineering is a scam.

1, a, 3 ?

(I just find it weird people write their 2s as ‘a’…)