The resources are needed for the actual activities.

Like you cannot defragment your harddrive while playing a game, or more general you cannot update the firmware of a device while using it.

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It's like getting an oil change while the car is still running and being driven. The oil that is in circulation is at a high temperature so it's inefficient for lubrication and movement. The engine components are also moving at a high speed so any opening of the oil tank could cause a disruption to the movement of the car and could potentially cause damage. The same is true for sleep, while you are awake, your body is in a constant state of motion and as a result cannot receive the full benefits of quality rest and healing. To get the full restoring benefits, your body needs to power down and go into a restful state.

But why this recovery cannot be done while awake

Wut.....

It is a phenomenon known as "emergence"

It may seem, when you are looking at a flock of birds, that there is some kind of design at work. How does each bird know here to be, how do they keep this v shape? It is particularly mystifying when you see swifts flying in the complex formations they do.

In fact, it is much simpler than that. Each bird is obeying a very simple set of rules:

1. if you cant see another bird then you're the boss. Just fly where you need to go.
2. if you can see another bird keep it constantly at a constant angle and distance to yourself

It sounds simple but if each bird follows those rules then the result is a remarkably organised looking formation. I know this because I have been involved in simulating bird flight for various games and simulations. All it needs is those two rules and you end up with something that looks complex and natural.

We're not SUPER sure exactly, but it's kind of like how your phone needs to turn off to update. I would imagine your brain rewiring things significantly while you're awake would get REALLY weird.

The body needs time to focus on certain maintenance tasks for which there was no time during the day. Muscles recover, food is digested, the brain is dreaming to help process new information etc.

This is because it was important for our ancestors to completely focus on activities such as hunting while awake and use sleep to recover at night while it is too dark to do much anyway.

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I watched a video about the birds a while back, the researchers said the birds don't seem to have any awareness of the overall shape they make, each bird is just paying attention to the nearest (maybe) 5-7 birds and doing what it can to not crash into them.. this makes it a near constant change in direction to wherever they'll fit and not crash.. I'd imagine it's similar with fish (though I think I remember Nova showing sometimes they group up to appear larger to predators, no mention of 'how')

There are a couple of aspects to consider: Legal requirements, road conditions and driving culture, price/quality of parts and conceived quality (vs the brand of the car).

Legal requirements may require certain tests to be performed and passed (e.g. braking). Suspension (and tires provided) have an influence.

Road conditions in Germany (e.g. high maximum speeds, but pretty good surface) are different from the US (bad roads, generally more relaxed driving / better distance keeping).

Parts: If the suspension is treated more poorly, it will wear out sooner. So in certain countries they may be forced to provide better but pricier parts. Bearings come to mind too.

Cheaper cars may not get any tuning. More expensive cars have the driving experience match the brand (e.g. Ferrari has a different suspension compared to BMW).

Rich Rebuilds had an episode like this. The car featured there was not very old.

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It's due to the tilt of the earth's axis, the further north the shorter the days in winter but longer in summer. So London has a shorter winter day than californa but longer summers day

The tilt of the Earth's axis. The axis the Earth spins on is not straight up and down when you look at the orbit that the Earth takes around the sun. It is tilted at 23 degrees. If you look at a globe, you'll see something called the arctic circle. Winter happens in the northern hemisphere where the axis is pointed away from the sun. If you are north of the arctic circle, you will have a period where the sun never rises in the winter. As you head south, the day period gets longer and as you go south of the equator, you find it has gotten longer still until you are at the south pole and find that it has 24 hour a day sunlight for a period.

 

Bottom line, the north pole points away from the sun in northern hemisphere winter and the closer you are to it, the shorter the days.

California is further south than London. Since it's summer in the Southern hemisphere, the days are longer there. The further South you go, the longer the days are, because you're closer to where the sun is directly overhead.

Conversely, if you were at the geographical North Pole right now, you would have zero daylight all day, as they are so far North that the sun doesn't come up over the horizon. They have a several-month-long night.

The length of the day has to essentially due with the shadow of the earth. Night time is being in earth's shadow. Because the earth is at angle to the sun, the sun does not koe directly over head, meaning the number of degrees the sun has to travel across the sky are fewer. So, the earth rotates the same number of degrees per minute (roughly) and when the sun has to traverse fewer degrees to make it nighttime again it becomes nighttime sooner.

California is nearer the equator than london, so, although angled away from the sun, it's not as much of an angle as it is in london

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Its the same issue with battery run-time in phones and laptops. If you incorporate a slide-in framework like a cordless drill, it takes up room and the battery has to be a bit smaller, leading to slightly less range.

My newest laptop has the same size screen as m last one, but the last one had a pop-off battery. The new one is slimmer and lighter than the old one but the battery is smaller.

Mi dad had dementia from NALFD (non alcoholic fatty liver disease) his brain was kind of "whole" (contrary to alzheimer) but his liver could not clean toxins from his blood so he got hepatic encephalopathy which caused brain damage. Its like having cirrhosis but not from alcohol but from years and years of abusing sugar.

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There are a range of types of dementia, and they all look slightly different on scans of the brain (often MRI's) and might have different signs from blood or other tests that differentiates the types from each other.

The different types also effect people's function slightly differently, and both family history and just general life history can help with determining the type of dementia. For example, if someone is known to have had a history of alcohol excess they might be more likely to develop an alcohol related form of dementia so that might be the starting point for investigations.

Alzheimer's is the most common hence being the one most people are aware of.

The other main types are:

Frontotemporal dementia, which often develops slightly younger and can lead to quite significant personality changes and challenging behaviours (among other things).

Lewy Body dementia, which can often present quite similarly to Parkinson's disease.

Vascular dementia, which is often correlated with multiple strokes or other vascular (blood flow) changes to the brain. The functional impacts to a person can often depend on which part of the brain is most impacted.

Mixed dementia, which is essentially a combination of types.

But that isn't an exhaustive list and there are other less common types, and yes most of them have names.

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Your comment has been removed for the following reason(s):

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If you would like this removal reviewed, please read the detailed rules first. If you believe it was removed erroneously, explain why using this form and we will review your submission.