letsboldlygomotherfuckers:

swimming pools are so weird man we dig holes in the ground and fill them with liquid we cant breathe in and then spend an hour or so at a time trying not to drown in it

sharpestrose:

systlin:

Something I find incredibly cool is that they’ve found neandertal bone tools made from polished rib bones, and they couldn’t figure out what they were for for the life of them. 

Until, of course, they showed it to a traditional leatherworker and she took one look at it and said “Oh yeah sure that’s a leather burnisher, you use it to close the pores of leather and work oil into the hide to make it waterproof. Mine looks just the same.” 

“Wait you’re still using the exact same fucking thing 50,000 years later???”

“Well, yeah. We’ve tried other things. Metal scratches up and damages the hide. Wood splinters and wears out. Bone lasts forever and gives the best polish. There are new, cheaper plastic ones, but they crack and break after a couple years. A bone polisher is nearly indestructible, and only gets better with age. The more you use a bone polisher the better it works.”

It’s just. 

50,000 years. 50,000. And over that huge arc of time, we’ve been quietly using the exact same thing, unchanged, because we simply haven’t found anything better to do the job. 

This story is also excellently cool because it’s yet another example of how everybody benefits when specialists from different fields communicate with one another.

broliloquy:

protect-lgbtqia-kids:

eggcup:

run-up-the-sail:

pisshets:

If you add two pounds of sugar to literally one ton of concrete it will ruin the concrete and make it unable to set properly which is good to know if you wanna resist something being built, French anarchists used this to resist prison construction in the 80s

I’m just gonna go ahead and reblog this for purely educational purposes.

added bonus is that concrete now taste good

Sugar does not really do that.

What you need is citric acid (you get that to get the hard water residues out of your pots/water boiler/washing machine), looks like sugar granules.

Or concentrated vinegar.

Cement needs a high ph to bind properly.
So if you add acid, it won’t properly set and/or needs 3-4 times longer.

Speaking as someone who works in the concrete forming industry: the easiest way to severely fuck up any large concrete pour is to delay it at the wrong moment.

If someone is trying to build a huge fuckoff concrete thing – say, for instance, a giant wall – they’re going to need an obscene quantity of concrete, and that’s all going to have to be transported there from the nearest mixing plant. This means they’ll have multiple trucks coming by to decant concrete in consecutive pours while the workers place it and vibrate it to ensure it all intermixes and sets properly, forming a monolithic mass. If one pour is allowed to set before the next one is added, you get a big, ugly, possibly structurally unsound gap between the two called a “cold joint.” A bad enough cold joint can completely fuck your whole project because the next engineer or inspector who sets foot on that site is going to take one look at that motherfucker and immediately embark on a quest for blood vengeance. You will literally have to cut that whole section of wall out, slap some dowels in the nearest structurally sound bits, and re-form and pour the offending segment from scratch, which represents a fortune in cost overruns and will make everyone involved very upset. This is an especially bad problem in hot climates, because the concrete curing process is exothermic – that stuff sets much faster when it’s really hot out, and its 28-day compressive strength tends to be poorer as well.

So if, hypothetically speaking, you wanted to completely shit up a wannabe dictator’s enormous unfeasible poured concrete vanity project, you could literally just randomly hassle and delay every concrete truck on its way there. Dude’s gonna end up with a giant worthless pile of shitty crumbling concrete and exposed reinforcing steel, and an army of pissed-off contractors to boot.