1
47
ELI5: What happens inside of a USB flash drive that allows it to retain the new/altered data even when it's not plugged in?
It has a bottom, it's just leaky. So you have to keep topping off the water. To make it faster, you just add water to every cup. So when you go to check if a cup is a 1 or 0, you have to see if the water level is above or below half way.
Consequentially, this is how the encryption on the macbook was bypassed a few years back.
The computer kept the drive encrypted, which means the computer needs a special decoder ring to make sense of the data. The computer gets this key when you type in your password, then saves it in ram. Ideally, once the computer is turned off, all the cups storing the key empty out, so if someone steals your computer, they can't get it.
However, it takes a little bit of time for the cups to drain all the way, even if the computer is shut down. So someone figured out if you could remove the memory from the machine fast enough and freeze it (literally freeze it in something cold ), you can slow down the leak (just like freezing the cups ) . That gives you enough time to carefully look into each cup and compare the amount of liquid in each one and guess if the cup used to be a 1 or a 0.
9
One day, the President finds a nasty message scribbled with pee on the snowy White House lawn.
I've ordered devices like that before - wasted a pretty penny, I don't mind telling you. And if The Penis Mightier works, I'll order a dozen!
1
I lit a styrofoam cup full of crushed ice on fire
How much would it cost to get one of these for home use?
1
Powdered sugar is flammable
It increases the air-fuel ratio until it's stoich (or close to it). Yay stoichiometry!
2
What my GF got me for X-Mas. Seems legit...
Oddly enough....I purchased a set of baby onesies printed to look like star fleet officer uniforms. They both came with star wars tags that look a lot like that
1
Intelligent crow.
I argued with my first grade teacher over the proper pronunciation of "aphid".
I said it was with a long a, she said it was a short a. Neither of us would budge until she finally looked it up. Turns out we were both right.
Bitch still called my parents
1
Forget BroScience. What's the best/worst piece of MomScience you've ever gotten?
Seriously. We have one year old twins. At six months they were kicking my ass. One of the reasons I started working out more religiously was to keep up with them
3
Forget BroScience. What's the best/worst piece of MomScience you've ever gotten?
I shudder at the thought of lugging around cans of cheese in a backpack. That's weight plus bulk plus a ticking time bomb waiting to turn your pack into bear bait.
The little squeeze packs are where it's at (it goes great on beef jerky )
1
We don't need a thinner iPhone - If that means killing the headphone jack
There are cases for a lot of phones (mainly flagship phones) with built in batteries. Pretty much does exactly what you want.
1
We don't need a thinner iPhone - If that means killing the headphone jack
And moving to a purely digital transport medium makes it much easier for them to lock down the format and prevent non-licensed products from working with the device.
1
What fact or statistic seems like obvious exaggeration, but isn't?
Also, it seems that pigeons seem to figure it out just fine indicating humans tend to trust what they think should happen over imperial evidence
1
Laser shotgun.
As someone who has worked in the field for a while....you'd be surprised
154
This rock gets it.
No. ... "nothing" IS written in stone. It's right there in your picture
1
A $40,000 drone.
First or second gen? I have a second gen on order but they have a 30 day lead time right now.
1
A $40,000 drone.
That's probably a FLIR Lepton core. It is most definitely ITAR controlled. The ITAR compliant version has the frame rate crippled
2
A $40,000 drone.
That array is pretty new. High quality microbolometers are pretty new tech. This project likely had a development cycle of a few years. So when the performance spec was written and the platform designed, it was with the smaller array being the one they could get. It isn't simple too retrofit a new array just because it's better, especially with the fpas being from different manufactures.
Also, a bigger array doesn't make it better. There are many more factors to consider....noise factor, sensitivity, back end processing, SWAP, etc that might make this new array not as good for the intended mission.
2
An old mineshaft collapsed in my friends garden.
Nothing any time recent. There was one person that fell in Quincy, but that was staff and he/she was inside the mine. Quincy is also pretty well mapped out. There isn't much on the surface that is unknown or unstabilized.
Head north and hunt down the smaller sites, and there are some undocumented open shafts. It took a few years of research before I found one. People excavating basements in Houghton and Hancock also stumble across old stopes and vent shafts.
3
An old mineshaft collapsed in my friends garden.
Holy cow. Do not... (let me repeat) DO NOT!!!! Go into that shaft!!
That thing has been sitting for decades with the shoring timbers rotting away. It's obviously unstable since it collapsed. You do not want to be in there if more collapses.
That is a vertical shaft and you have no idea how deep it goes. If it is a hard rock copper mine, it's likely a stope and drift construction. Those vertical shafts can run extremely deep. If you fall in, you will likely die.
This mine has been closed up with poor to no ventilation. It is likely filled with low oxygen content air or air laced with poison gas. You can be overcome, lose consciousness and die in minutes and never know it's happening.
You need to rope this off and call it in. The local mine inspector would be my first call, but if you can't find him, call someone. Police, fire, anyone who can get the ball rolling to get that inspected and capped.
With that out of the way though...it is pretty cool. Where are you located? If in the states, I'm guessing Montana or the UP of Michigan.
1
Gym Story Saturday
My gym has a large cardio room with a bunch of weight machines downstairs and a full free weight room upstairs. I'm only about 8 weeks into lifting so I've been sticking to the machines downstairs where is harder for me to screw up my form.
So after 8 weeks I'm finally starting to see some results. I'm really thin, so I'm pumped to finally have sort of definition in my upper body.
Yesterday, I was feeling particularly good about myself. I just broke 300lbs for my 10 rep max on leg press and did 130 on (machine) bench. I'm standing in front of the mirror doing shrugs on the cable machine, feeling like a beast because I can see my abs through my shirt.
I then decided that I would run upstairs to do barbell curls, to see if there was a standing rope forearm thing and to just check things out. I swear I deflated the moment I stepped in there. I went from feeling like a beast to feeling like an Ethiopian marathoner.
1
Gym Story Saturday
There's this one old dude that just sits in the locker room, naked, reading a news paper. He'll be there when I get there and still be there an hour and a half later when I'm done.
1
Advice on squat vs front squat
That's pretty interesting. I was a big distance runner and cyclist for years and had horrifically tight hamstrings (and everything else). I spent a ton of time stretching and got nowhere. I've been lifting regularly for about 12 weeks now, and have noticed too that my flexibility is the best it's ever been, and I'm not really working on it.
1
I have a phobia of over engineered buildings
Did you hear the one about the Buffalo buffalo that buffalo Buffalo buffalo? They buffalo BUFFALO buffalo!
1
What subbreddit did you used to hang out at, but grew to despise?
in
r/AskReddit
•
Apr 25 '16
Lifetip 105: How to repurpose rebar as a hacksaw
Step 1: cut rebar to length with hacksaw*
*if hacksaw is unavailable, a piece of rebar can be substituted. See lifetip #105 for details