Serious question. I've never understood how sea levels measured in the past can be compared to now that we are using satellites. Before satellites was there even a means of measuring global sea level? The same question has bothered me about climate measurements which in the past were not digital and inaccurate. Not a denier, just always wondered about this and never thought to ask.

Is humour a good test for an AI's Sentience

What is missing here is the practical part. You use a torque wrench to accomplish this. They have a part that let's you set the required torque, and then you turn the bolt with the torque wrench until the wrench clicks. Google torque wrench for an image. Older torque wrenches had just a pointer and scale and depended on the elasticity of the wrench handle to get the right torque. They were fairly inaccurate.

Theoretically undoing a torque bolt requires the same torque. Real world that depends on a lot of things...

Freddie Mercury.

I wasn't allowed to listen to rock growing up. I heard this band queen on the radio after I got a car. Started buying albums on cassette, bought all their albums, freakin loved that band. One night I was up late and my parents were asleep and I watched a documentary on PBS about queen. At the end it said it was dedicated to Freddie Mercury with his birthdate and date of death. I admit, I cried.

Still enjoy listening to them once in a while, I've mostly moved on to bands like Muse and Coheed and Cambria...

I don't know what this was, but the mental imagery has me cracking up.