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I make my bed every day, but not I’m the morning. Most of the time, if I’m on an early shift at work, I just don’t have the time. I also believe that it’s a good idea to air the bed out, so I leave it unmade for as long as possible. I’ll often make it while I’m running a bath in the evening, especially if I’ve just got back from the gym. As a very last resort, I’ll make it before bed, as I can’t sleep unless it’s been made.I remove my top quilt, then what I call the foot sheet (a sheet folded in half and tucked in the bottom of the bed to stop my feet from escaping), then the main quilt, then the top sheet.I lift the mattress onto its side, and pull the fitted sheet and the sheet under that tight.With the mattress still on it’s side, I place the top sheet on the mattress, then the main quilt.I put the mattress back down, and, if it’s all gone to plan, both the sheet and the main quilt are now tucked in tight against the side of the bedI pull the top sheet down around the foot end of the bed, and tuck it in underneath, before folding the excess over the top of the main quilt at the head end of the bed.Next comes the foot sheet, which covers the lower 1/4 of the bed, and tucks in around the bottom to keep my feet in place.Now I move on to the top quilt, which I tuck into the gap between the side of the bed and the wall.Finally, I place my pillow at the top (just one memory foam pillow), and my folded pyjamas at the bottom of the bed.I’m very particular about sheets, and I find anything other than brushed cotton very uncomfortable. In the summer I might go without the second quilt, but most of the time I’d rather have a nice cold room and the additional weight of the second quilt. I try to change my bedding my once a week, and I keep it in sets, so I have a fitted sheet, plus and old fitted sheet or and old quilt cover, along with a flat top sheet, folded up and kept in a pillowcase. By keeping it all together I never have to spend ages looking for it. Also, once I’d worked out gold to fold a fitted sheet, ever became so much simpler.

I mentioned in my last answer that I’ll be writing a detailed answer regarding all the Online Platforms(YT, Unacademy etc.) that I used during my preparation. These had a HUGE role in my preparation. But the internet is really vast and finding the right sources becomes really important. So, here’s the list of all sources that I used:CHEMISTRY:PAID:Etoos (JH SIR) :Jitendra Hirwani Sir’s lectures really strengthened my basic concepts. Also, Sir’s PYQ discussion course is amazing. He not only discusses that particular question, but also tells about the corresponding theory, question variations and many techniques to solve questions with ease.Unacademy Plus:Piyush Maheshwari Sir:When I was in mid 12th, I realised that my inorganic was not as strong as I would like it to be. At that time, I came across PMS sir on Unacademy. His lectures are really a boon to anyone preparing from them. Inorganic becomes “UNDERSTANDABLE” after studying from Sir. Perfect theory and then problem solving courses were also done in order to strengthen the theory.Mohammad Kashif Alam Sir:One of the best teachers for Organic Chemistry. He covers every single detail of the topic from “Micro to Macro” level. Perfect for JEE ADVANCED preparation. His BRAINANZA course for JEE ADVANCED was one of a kind and really amazing questions.Sharad Kothari Sir:I came across SK sir during the end phase of preparation around March, April I guess. But then there was no turning back. The “Super Jumbo Tests” conducted in special classes were perfect for revision of entire theory and major mechanisms. He stayed with us till the JEE ADVANCE exam. Mostly, Revision and problem solving lectures.Brijesh Jindal Sir:The Advanced Problem Solving Course on Unacademy Plus was the course that strengthened my Physical Chemistry. Before this course, I used to live in the illusion that my physical Chemistry is strong. Really an eye opening course for JEE ADVANCE ASPIRANTS.Free (More aptly, Priceless):ATPStar(YouTube):When I was really struggling to understand the basics of organic chemistry, Vineet Khatri Sir’s videos helped a lot in understanding the most basic things. Basics are often underestimated, but for solving JEE ADVANCE type questions, your basics have to be really strong.IITIAN EXPLAINS(YouTube):This is the YouTube channel of MKA sir whom I used to follow on Unacademy too. High Quality Content for a High Quality exam (JEE ADVANCED). This channel has some very unique content like comprehensive videos on exceptions of Tollen, Fehling, Iodoform tests. Every major reaction has been covered in detail with mechanism (obviously) and good questions.VYAS EDIFICATION:Shishir Mittal Sir is a Legend in the field of Chemistry. This channel turned out to be a blessing since it not only provided daily quality content, but it also helped me to follow a fixed routine which was kind of becoming difficult due to the lockdown. The videos were uploaded early morning everyday (5 min Chemistry). The videos were short, but consistent and high quality dosage.PHYSICS:Paid:Nitin Vijay Sir (Etoos):He really sets the environment in his class. His teaching style is very unique and captivating. He takes really good (standard) class illustrations.Kailash Sharma Sir (Unacademy and Unacademy Accelerate YouTube):Lots of quizzes, NTA test discussions and Most expected questions series. Also, I got help in covering all the JEE MAIN EXCLUSIVE chapters which are every aspirant’s misery. Some special topics like method of images in electrostats, superposition principle in current electricity were also covered. The best part about Sir is that he discusses each and every question he takes and never leaves any doubt unclarified.Priceless:PHYSICS WITH AKASH GOYAL (Bold font for a reason):The Best Channel for JEE ADVANCE preparation. This channel doesn’t get the amount of subscribers, attention that it deserves. But trust me, it is really amazing. Sir has uploaded nearly 300 Advanced Problems with proper solution and explanation. Theory videos are under progress. Also Sir’s explanation is at another level. So, if you are preparing for 2021/22, do check it out. The Advance Problems playlist covers questions from Irodov, Krotov, Pathfinder, various test series. This channel is a perfect place for JEE ADVANCE ASPIRANTS. I personally covered all the Advance Problems twice. And considering this year’s paper level, these illustrations are a perfect boon to everyone preparing for ADVANCED.Physics Galaxy (Revision Checklists):Amazing videos for theory revision. All topics and subtopics covered and standard cases discussed too.RKH Sir:This channel is also really good as it contains lots of questions of Irodov, INPHO and some questions from Harvard as well. But the only disadvantage is that it’s a bit disorganized, so you’ll have to work a bit to search. But the questions and the discussion is really great. Do check it out.Coachengg (YouTube and app) (For both Maths and Physics):The channel is very good. Contains good theory revision videos. Also, their Telegram group is the best. Both Rohit Sir and Nitesh Sir actively answer doubts. Frankly speaking, it was the only telegram channel where my doubts got clarified.Indian School of Physics:I found this channel very late. I guess a month before JEE ADVANCED exam. And so I couldn’t do it completely, but most of my friends have told me that it is really great. Do check it out.Maths:Paid:Manoj Chauhan Sir(Unacademy Plus):Perfect theory coverage and high quality class illustrations. Also, his sheets are just too good. He encourages us to think and think until we find the solution ourselves. Made maths Super interesting for me.Om Sharma Sir(Unacademy Plus):I followed Sir for two courses - Rank Refiner 1 and Rank Refiner 2. Perfect courses for the time when you’ve completed the theory and are looking to strengthen your entire syllabus.Priceless:Mohit Tyagi Sir(YouTube):Whenever I was in doubt or felt that I needed more clarity in a particular topic, I used to refer to Mohit Tyagi Sir’s channel. All topics have been covered in a very detailed manner. Also, the lectures are quite slow paced so anybody can understand irrespective of his strength in the subject.G Tewani Sir (YouTube):He is the author of the Cengage book series. But idk why his channel is not famous enough. Contains wide variety of problem videos and some amount of theory too. A lot of JEE ADVANCED LEVEL content but the only disadvantage is that videos don’t come very often. But the vast collection of videos already present on this channel is a boon.Lucky Jethani Sir (Unacademy special classes and Unacademy Accelerate):Sir discussed the Black book of Algebra and Sameer Bansal book of calculus live on YouTube (selected questions only). This helped immensely in improving problem solving skills. Also, he discussed a variety of questions from AITS and many other resources in special classes on Unacademy.People often underestimate the power of online education. There are so many quality resources out there on the internet. But choosing the right resources is a skill. And I think I have helped in the process. There may be many other sources, educators which I may not know about, so please write about them in the comments, so that other people can benefit.Also, share this answer so that it may reach a wider audience.Signing off✍

The most obvious answer is, of course, the Space Shuttle.That’s right, I said it. No other vehicle in the history of manned space travel has lost two full crews during flight.[1] The whole design is an abomination of committee-designed inefficiencies right from the start. Even Wernher von Braun thought it was an absolutely awful design[2].Start with the original design which was a delta-winged “space plane” at the top of a Saturn V like rocket, comparable to the X-20 DynoSoar project. This design, known as “on-axis” means that the shuttle sits at the top, safe from exhaust blasts and debris from launch, and all of its surfaces except the un-exposed tail-end are free to be designed however is needed for space-flight and re-entry.The DynoSoar had its issues though, and it was never launched in an actual rocket configuration. Several of the test pilots quit the program after the Air Force squabbled about which booster to use, including one named Neil Armstrong.But the design was basically a good one. Von Braun had proposed a shuttle, but his design was more like what we see with Virgin Galactic’s Space Ship Two design, with a carrier that takes the shuttle into the stratosphere, where the main shuttle engines then ignite to carry it to orbit. In von Braun’s plan, the entire system was reusable.That, however, didn’t make Congress and the companies like Boeing and Lockheed very happy. Re-usable meant they couldn’t sell you a new $100,000,000 rocket engine on every flight. Re-usable meant that assembly jobs were a one-time thing, and then congressional districts lost jobs and money. On the other hand, expendable meant the gravy train kept running.So, as Apollo drew to a close, they pointed at the DynoSoar program as the model, and said, “This is the shuttle we want.”But, then the committees got a hold of it. Simply getting people to and from space wasn’t enough. NASA wanted a way to get astronauts into space, but NASA had a limited budget. The Air Force wanted to get satellites to space and they had a much larger budget, so the Air Force got brought into the discussion. The Air Force, however, wanted cargo, not people. Other groups like the NRO (National Reconnaissance Office) and the like said they needed to put up satellites the size of school buses for doing satellite reconnaisance, i.e. spy satellites.That means that the small, manageable X-20 sized shuttle was tossed out in favor of the giant cargo space of what came to be the Space Shuttle. But, more cargo space means more “space-plane” to house it. That raises the mass of the shuttle. More mass means bigger wings to land it, and more powerful rockets to lift it.The whole thing became an almost comical cycle. With the shuttle needing that much lift, the engines became so expensive and time consuming to build that even Lockheed said they could no longer be expendable, and had to be re-used to make the shuttle even vaguely affordable. That meant the engines had to be recovered, which meant they had to be part of the shuttle. With engines mounted in the tail of the shuttle, it couldn’t sit on top of the stack any more.And that’s vitally important. In the event of an accident, a capsule mounted at the top of a rocket stack has a chance to escape. When you’re strapped side-by-side to a giant bomb, as Challenger showed, there’s nowhere to go when something goes wrong.Worse, strapping to the side of the stack (off-axis for those who are picky about such terms) leads to all kinds of other compromises. The piping for fuel must now go directly through the heat shields that cover the bottom of the shuttle, creating headaches in just how to ensure that the covering is safe for a 3500 degree re-entry.The shuttle is now in the path of any debris breaking away from the fuel tank. (This was opposite what you saw on the Saturn V launches, where great sheets of ice would peel away from the cryogenic tanks on the rocket, falling harmlessly along the surface of the rocket.) This meant the fuel tank had to have extreme insulation to prevent ice from forming, because the ice would now crash into the shuttle, cutting through its fragile tiles that protected it from reentry. So, thick foam insulation was placed over the entire tank, adding more weight, and more headaches, because the slightest flaw in how the foam bonded to the surface meant chunks of foam peeling off the tank and striking the shuttle. This was what would lead to the destruction of Columbia.The main weight at launch is in the expendable fuel tank, carrying nearly 1.6 million pounds of hydrogen and oxygen, 20 times the mass of the shuttle itself. If you think of the engines on the shuttle as lifting that weight, then imagine that the center of gravity is nearly 20 feet off-line from the lift of the engines that are lifting it. That meant the shuttle, and the fuel tank, had to have reinforced structures to support all that off-axis thrust. And that meant even more weight to be lifted to orbit in the shuttle, and nearly to orbit in the fuel tank.The numbers got so bad, the only way to solve the problem was to strap on giant, solid-fuel rocket boosters to get this travesty off the pad. But solid fuel has a problem. It has exactly two settings, “Not Lit” and “Full Throttle”. Now, to be technical, the SRBs had fuel mixes pre-loaded that created a thrust profile to match the flight events like Max-Q, and other adjustments, however, this was not an exact science and usually there were 2–3 second windows where the thrust profile would change, and the shuttle main engines would have to compensate.Additionally, the SRBs were prone to “thrust oscillation” (think bouncing up and down like a pogo stick) events, vibration along the direction of travel, which tended to shake everything violently. Again, these were also there to lift the 1.6M pounds (800 tons) of fuel in the external tank. These boosters were also mounted off-axis, meaning they were also lifting on a lever arm 20 feet off-axis from the center of mass.This meant more reinforcement and more weight. In the end, the STS (Space Transit System) was burning about 3.8 million pounds of fuel (1.6M in the external tank, plus 1.1 million in each booster) to lift the 200,000 pound shuttle into orbit. That’s a 5% fuel to weight ratio, which is actually rather good, but remember, the shuttle wasn’t actually the cargo.The cargo was whatever satellite or bit of the space station they were trying to launch into orbit.The maximum weight that a shuttle could take to LEO (low-earth orbit) was 65,000 pounds. So, the shuttle burned 3,800,000 pounds of fuel to get a maximum of 65,000 pounds to orbit. The average cost per flight on a shuttle was about $450,000,000 per mission. That’s a cost per pound of $6923 and change to low earth orbit, and the shuttle almost never flew at maximum cargo weight.To put it in perspective, while the Saturn V was more expensive (about $1.16B per flight in modern dollars) it could carry 261,000 pounds of cargo to orbit, a price per pound of about $4445. And they were throwing the entire rocket away on each flight.To put that into perspective, the entire ISS weighs about 440 tons right now. The Saturn V could have lofted that in four flights, and almost could do it in three. (130.5 tons per flight.) The Space Shuttle had 36 designated ISS missions to loft parts of the station, and several parts were added by Russia, Japan, and even the ESA without the help of NASA. In fact, the current mass includes several portions brought up by SpaceX and Orbital as well.All this doesn’t even mention the fragility of the tile system on the shuttle. Every mission required the inspection of every tile, and the replacement of hundreds if not thousands that were damaged on each flight.The Main Engines had to be totally refurbished after every flight, the entire turbopump assembly removed, and rebuilt. The idea that was sold….…was nothing at all like what was actually delivered.When added to the Shuttle’s dismal safety record, the broken promises of re-usability — Congress was promised it would fly, “once a week with only minor refurbishment between flights” — there’s no choice about the worst rocket design ever put into use, and that’s the Space Shuttle.(Edited to correct the term “Pogo” for SRBs — which is reserved for on-axis oscillations in liquid fueled rockets — to the correct term, which is “Thrust Oscillation”.)Do you like answers about space? Come find all my answers and some additional commentary at “Space Between My Ears”.Footnotes[1] Two Full Crews During Flight[2] Werner Von Braun’s Space Shuttle