Remember - markets can remain irrational for longer than your can remain solvent.

That's about the only way it has worked - roughly standard hydro plant hardware in a dam placed across an estuary. Down horrible things to that estuary's environment, but a new environment develops afterwards

Tidal power has been a challenge because seawater is an unforgiving environment for mechanical things, as well as being very dense and exerting lots of force on everything.

Simple turbines secured to the sea floor are still beyond our ability to make reliable. With pivoting wings and bearings, I give this thing a few days of operation before it falls apart.

In this case, it seems as if the SnapChat app on either end detected a message that included a threat, and forwarded the cleartext to themselves and the authorities. If the app doesn't detect a threat, then it would send the message to the recipient securely encrypted.

No - that is one of the worrying things about this. Loose bolts are a completely different issue.

There's an interesting story on pprune.org that the aircraft needed some rivets and the plug's seal being replaced. So there's paperwork for the replacement of the rivets and the seal, but none for the reinstalling of the plug. Because it is in the books as a door, and closing a door doesn't require paperwork. Except this door has bolts and nuts and split pins that must be properly installed. Calling this plug a door might have punched a huge hole in several layers of the Swiss Cheese model.

It is about realizing that there are racial and disability based biases in your recruiting system, and that in order to actually hire the best employees you need to do something to push back against those unintentional, but very real, biases.

Which is another very secure and well tested approach. But like locking wire, in order to work they have to be installed.

This isn't a plug door as in a door that is smaller than the opening, and opens inwards. The door is smaller than the opening, but has 8 stop pins that line up with 8 stop pads on the frame. When it is closed, these take the forces on the door. To open, the door is moved upwards, the pads clear the pins and the door can open outwards and then hinge downwards.

It is more a plug in that it is something placed to plug up the door opening, than it is a classic plug-style door.

There are 4 bolts preventing the door from opening. The door needs to slide up on rods attached to the two lower hinges, each has a bolt through the ring and rod locking the two together, with a castellated nut secured with a split pin. There are two a hook arrangements on the door that fits over roll pins on the frame - this hook has a bolt across its mouth preventing the hook from moving upwards - again, secured with a castellated nut and spit pin.

Just one of those four bolts would prevent the door moving upwards and out of the hooks. There's no force on those nuts, no cause for them to loosen even without pins. At least the lower two bolts are under constant weak shear force from lift assist springs, which would prevent the bolts moving even if the nuts were not there.

And pictures of the door and frame show both largely undamaged apart from damage explained by the process of the opened door being ripped off.

There's no reasonable explanation of how the door could open unless none of those bolts were ever installed.

Well, if this is the story, it sure sounds like an example of bad management!

This came from a commenter at the aviation subreddit.

> The much older 737-900 shares the same door plug assy as the 737-9MAX. No other models do.

> Spirit says they "semi-rig" the door plug before shipping. To me this means it's not fully installed. The reason is because the door plug assy is removed upon receipt to gain an additional access point for final assy work.

> However, I bet that's only true for the 737-900 and that for the 737-9MAX the final assy work is completed without ever removing the door plug.

> The Spirit planner copied over the semi-rig task from the 737-900 to the 737-9MAX. The Boeing planner didn't add a final rig task because the door plug was never removed and they assumed that meant fully installed.

This also would explain something that many find hard to understand - why only the 737-9MAX is grounded pending inspections, not the 737-900 which has the same plug door. Every 737-900 had the door opened and then sealed by Boeing engineers.

Formaldehyde is a natural substance. A result of much fermentation, and lots of stuff we eat is broken down to formaldehyde, and the body metabolites it, to methanol and finally formic acid, which is excreted.

You'd have to take in a fair bit of formaldehyde for it to be a problem. Small amounts leached out of foam aren't going to be a problem. Drinking yesterday's orange juice would give you a whole lot more.

....then we can switch this to locking the carbon up in some permanent form - probably as plastics. And if fossil-fuel derived plastics have been phased out - well, mission accomplished, really. Oil stays underground, where it belongs.

As I understand it -

At present Gas plants have two purposes - the first is baseload generation when the renewables can't keep up. That's a lot of work, but it isn't very profitable. The second is maintaining grid stability, keeping the grid frequency at 50 or 60 hertz, second by second. The gas plants were earning a lot of their money doing the first, just keeping their massive turbines spinning but not generating power - but that is a job that batteries can do a lot better. Batteries and their attached inverters can react within half a cycle, 1/100th of a second, gas plants take a few seconds to ramp up.

Without the payments for grid stability, gas plants can't balance their budgets.