Today I Learned
- Thread starter Greg Bernhardt
- Start date
Join the discussion
Registration is free. Ask a follow-up in this thread, or start your own.
6,975 replies · 555K views
Gold Member
- 5,661
- 4,508
Wise-as* answer: Test Intelligence LonginglyStavros Kiri said:
Real answer: Today I Learned (the title of this thread)
DaveC426913
Gold Member
2025 Award
- 24,617
- 8,961
Today, Stavros learned:
What TIL stands for.
What TIL stands for.
Stavros Kiri
- 1,147
- 1,011
Til later ...DaveC426913 said:Today, Stavros learned:
What TIL stands for.
Til now I didn't know, ... s till learning! ...
rbelli1
Gold Member
- 1,092
- 446
Drakkith said:
Wouldn't stop drop and sink summarily extinguish the flames?
BoB
Stavros Kiri
- 1,147
- 1,011
I'd like to think of it as 0 min in the photons frame ...Stephenk53 said:
[So, we are in Mars! (!?) ...]
- 37,498
- 14,384
Today I learned the widely used "10 other cells per human cell in a human body" is probably wrong. A 2016 study revisited the estimates with improved methods and its result is 1:1.
(It was always clear that most of the mass of a human body is in human cells - that is easier to measure. The human cells tend to have much more mass per cell than foreign cells).
(It was always clear that most of the mass of a human body is in human cells - that is easier to measure. The human cells tend to have much more mass per cell than foreign cells).
Gold Member
- 5,661
- 4,508
So a Bacteria masses 1/350 what a Human cell does. That is quite a dynamic range. All that extra DNA maybe?
I wonder how a Virus compares, maybe a common cold virus.
I wonder how a Virus compares, maybe a common cold virus.
- 20,819
- 28,466
TIL a nice expression in integration: "If nothing works, use the substitution of desperation, the entire denominator."
- 20,819
- 28,466
TIL that there is such a thing as "... standardised to the European Standard Population". Quite logical if you think about it, but I never had thought about it.
CaptainAmerica17
- 59
- 10
TIL about personal responsibility. It's not fun cramming for school projects when the end of the semester is in a month and a half. Now I'm doing stress-relief math at 2 am.
- 14,793
- 7,438
Today I learned that "Bohemian rhapsody" is the most performed song of the 20th century. Perhaps I should change the title of my recent paper linked in my signature and call it "Bohmian rhapsody for instrumentalists".
Stavros Kiri
- 1,147
- 1,011
You're the captain! ...CaptainAmerica17 said:
CaptainAmerica17
- 59
- 10
Stavros Kiri said:
With great power comes great responsibility!
Buzz Bloom
Gold Member
- 2,517
- 465
TIL about the following site:
This link will display the photo for the current day. With your cursor on the picture, the symbol ">" on the right shows you the previous day's photo. If you keep clicking on this symbol, you will see the series of photos day by day going back at least to December 2017. I do not know how far back the series goes.
Hope you find this entertaining, but beware, it can become addictive.
This link will display the photo for the current day. With your cursor on the picture, the symbol ">" on the right shows you the previous day's photo. If you keep clicking on this symbol, you will see the series of photos day by day going back at least to December 2017. I do not know how far back the series goes.
Hope you find this entertaining, but beware, it can become addictive.
- 9,864
- 4,896
Demystifier said:
not the "Queen" version surely..
i'd assumed it was a sibling to this one
Stavros Kiri
- 1,147
- 1,011
Keep it up! ...CaptainAmerica17 said:
- 16,110
- 8,395
Today I learned about the airport cell phone lot.
For the first time in several years, I had to pick up a guest at the nearest airport. I figured I would do what I had done before, namely park in the garage, go into the terminal to meet him at the baggage claim, then pay a couple of dollars when leaving the garage.
Along the entrance road, I saw a sign, "Cell Phone Lot." Aha! I could park there for free, wait for my guest to text me his location at the curb in front of the terminal after he arrived and picked up his bags, and then simply zip over to the terminal. This is not a huge airport like Chicago O'Hare, so just 2-3 minutes after his text, we were on our way.
As I was leaving the cell phone lot, I noticed that most of the other cars were parked facing the opposite direction to me. Behind me (and in front of them) was an electronic flight arrival board similar to the ones inside the terminal. I hadn't noticed it when entering the lot, and I was checking the arrival status on the airport's website on my phone anyway, so I didn't really need it. It reminded me of a drive-in movie theater.
Just now I've read online that some cell phone lots also have restrooms, and even food trucks to provide refreshments.
For the first time in several years, I had to pick up a guest at the nearest airport. I figured I would do what I had done before, namely park in the garage, go into the terminal to meet him at the baggage claim, then pay a couple of dollars when leaving the garage.
Along the entrance road, I saw a sign, "Cell Phone Lot." Aha! I could park there for free, wait for my guest to text me his location at the curb in front of the terminal after he arrived and picked up his bags, and then simply zip over to the terminal. This is not a huge airport like Chicago O'Hare, so just 2-3 minutes after his text, we were on our way.
As I was leaving the cell phone lot, I noticed that most of the other cars were parked facing the opposite direction to me. Behind me (and in front of them) was an electronic flight arrival board similar to the ones inside the terminal. I hadn't noticed it when entering the lot, and I was checking the arrival status on the airport's website on my phone anyway, so I didn't really need it. It reminded me of a drive-in movie theater.
Just now I've read online that some cell phone lots also have restrooms, and even food trucks to provide refreshments.
DaveC426913
Gold Member
2025 Award
- 24,617
- 8,961
I am confused.
1] What does a cell phone have to do with the lot? I'm guessing you can wait there and have the arriver call when he's coming out?
2] What about 'cell phone lot' made you realize it would be free?
1] What does a cell phone have to do with the lot? I'm guessing you can wait there and have the arriver call when he's coming out?
2] What about 'cell phone lot' made you realize it would be free?
- 16,110
- 8,395
Exactly. And I could amuse myself by reading PF etc. on my phone while waiting.DaveC426913 said:
I had to drive into the entrance to investigate. It was actually "carved out" from part of a paid parking lot, using a fence. The paid part required driving through a gate; the cell phone part didn't. A sign stated that one could park in the cell phone lot for up to 30 minutes, and the vehicle must be attended at all times.
Now that I think of it, the "paid" part of the lot must be for airport workers, with the gate triggered by an ID card. It's not far from the cargo area, but kind of a long hike from the passenger terminal.
Stavros Kiri
- 1,147
- 1,011
Who knows, may be in the future (e.g. with 5G net, coordinated autonomous vehicles and planes, intenet of things etc.) we could even have more drive-through and drive-in services and facilities at airports, such as e.g. drive though check in (and baggage check in), drive through baggage claim, drive in waiting lot and check in and ticket issue automatically via the inernet, from your car, with smartphone or computer and portable printers ...jtbell said:
That would save time waiting in lines, or cut down on the suggested "2 hours in advance" ...
We could even see drive-through boarding on planes (in connection to the former drive through check in and baggage ...).
All that, of course, before we are all able to have our own "flying vehicles" ...
DaveC426913
Gold Member
2025 Award
- 24,617
- 8,961
I see some problems there. A lot of the red tape in airports is redundancy is passive security - such as physically clapping eyes on who is picking up the tickets, and who is dropping off luggage. Every monitored checkpoint is another place where ne'er-do-wells can get caught.Stavros Kiri said:
While it would be freakin' awesome to drop my luggage straight from my trunk to the conveyor, I'm not sure it's worth the security risk.
Stavros Kiri
- 1,147
- 1,011
Security is one problem. I am sure there are others too. I was planning to mention it but at the end I forgot. However, the same issue is central with a 5G net and internet of things, which they are currently working to improve (security). The red tape for security could (potentially) get alleviated, and more advanced sensors etc. would be designed for the drive-through purposes, I guess.DaveC426913 said:
- 20,819
- 28,466
Imagine that I had been of the firm opinion - before 9/11! - that flying takes too long, especially on shuttle routes like London - *. I seriously thought that it should become like a bus trip sooner or later. Why should it take hours to check in on a flight that lasts no longer than 3 hours? On highly frequently routes I thought: "arrival at the airport - buy the ticket - check in - board" should be a matter of ten minutes! E.g. if you have a look on the passengers on a Monday morning between London and Frankfurt, then you will see: they do not fly, they commute!DaveC426913 said:
Klystron
Gold Member
- 1,258
- 1,968
I visited a recently remodeled store implementing customer service queues such as at a bank. Several 'tellers' in windows with waiting lines. Customers gather in an outer waiting room. Periodically, all available customers are ushered en masse to fill the queues for next_available_teller.
All well and good except each window has its own queue! (I refrained from calling "Form one line!").
Mass of customers fill open queues and wait for 'their' teller. No crossing to other lines. Has management defeated the purpose of a queue?
[Now I'm curious given N open windows how many wait queues are optimum? Also given maximum occupants in the room? Applying mental min-max tells me one per room; but I hate waiting in lines]
All well and good except each window has its own queue! (I refrained from calling "Form one line!").
Mass of customers fill open queues and wait for 'their' teller. No crossing to other lines. Has management defeated the purpose of a queue?
[Now I'm curious given N open windows how many wait queues are optimum? Also given maximum occupants in the room? Applying mental min-max tells me one per room; but I hate waiting in lines
]
Last edited:
Today I learned that the first detected black hole merger released more than 3 solar masses of energy as gravitational waves in less than a second. This was equivalent to 5.3x1047 joules, and the peak power was greater than the power output of all stars in the visible universe combined. COMBINED.
- 37,498
- 14,384
Boarding alone takes longer than that unless it is a really small plane.fresh_42 said:
You can arrive at the airport an hour before your flight - if you don't have checked bags and get priority access at the security checkpoint (easy to get if you fly frequently) that is enough time. Boarding for big airplanes begins something like half an hour before the flight.
- 20,819
- 28,466
It took too long, it takes too long, and no betterment in sight! My dream of the layout of the boards everywhere is:
"destination - Airline - available seats - departure (- maybe costs)"
and a realistic expectation of time required: Check opportunities, go to the check in and buy the ticket (10m), go to the gate (5m, even on large air ports), boarding (5m - since there is no need to board all at once!), reserve time (10m) = 30m in total.
I know it is impossible for several reasons, but that was what I dreamt of: it should be as easy as a trip by bus or taxi. I remember once on SVO: I had to x-ray the same backpack at least four times all in all (don't remember the exact number, but it was ridiculous). Of course it was not ridiculous if you take these idiots into account, but that was part of my vision, too, that people do not murder strangers and everybody just wants to get from A to B.
"destination - Airline - available seats - departure (- maybe costs)"
and a realistic expectation of time required: Check opportunities, go to the check in and buy the ticket (10m), go to the gate (5m, even on large air ports), boarding (5m - since there is no need to board all at once!), reserve time (10m) = 30m in total.
I know it is impossible for several reasons, but that was what I dreamt of: it should be as easy as a trip by bus or taxi. I remember once on SVO: I had to x-ray the same backpack at least four times all in all (don't remember the exact number, but it was ridiculous). Of course it was not ridiculous if you take these idiots into account, but that was part of my vision, too, that people do not murder strangers and everybody just wants to get from A to B.