query stringlengths 8 249 | answer stringlengths 45 7.8k |
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have languages for animals developed over time similar to that of human beings, or say can a lion in this time communicate with a lion five hundred years ago? | While most other animals can *communicate*, they don't have true *language*. Many believe that the development of language also coincided with the development of conscious thought. In other words, the reason humans are sentient creatures and no other animal is is *because* we have language, and can use it not just to c... |
If you are you because you got half your DNA from each of your parents, why are older/younger siblings not physical carbon copies of each other? | Take 10,000 coins, and number them. Now flip them . If you do that 3 times, presuming your toss was fair, you'd expect that each time about 5,000 coins will be heads and 5,000 coins will be tails . If the heads are things you got from your father, the tails are things you got from your mother. How often do you expect t... |
How is a space rocket's weight supported while on the launch pad? | There are spots near the engine that actually sit on points that extend up on the pad. For the spaceX rockets they use [hold down clamps], which is basically raised metal pads, and part of the motor support structure just sits on top of them. They have hydraulic tops to lock it into place. [You can see more]. There are... |
How does gum have calories if we don’t actually eat it? | You're getting calories from the flavoring and sugar that you swallow and absorb through the area underneath your tongue |
Sometimes I get a sudden really loud high pitched ringing in one ear, (can be any one) that fades away quickly. What is it and why does it happen? | Here is a wonderful tip for tinnitus or ringing of the ear. Put your palms over your ears with your fingers interlaced on the base of your skull. Get your pointer and middle finger on both hands and tap the base of your skull for 15-30 seconds. Makes it go away like magic. You're welcome. |
If drums produce sounds that correspond to certain frequencies (e.g., C#, F), how is it that drums, when played, do not clash with the songs in different keys? | I don't know of a drummer that tunes their drum to a note. They all go for sound and punch. The sound is too short for thetmre to be a note in them. This is why things like steel drums and tuned steel percussion are tuned with a special tuner, that repeats the sound in their circutry. But you can end up getting clashin... |
How does seeing a crush or a SO cause the feeling of lightheadedness and 'butterflies' in the stomach? What are the butterflies? | I think I know this one! It's because the longest nerve in the body goes from your brain all the way down to your stomach/bum. It's called the vagus nerve. It sends signals up to your brain, and vice-versa. That's why when you're nervous, you can feel it in your throat, torso or stomach. At least that's what my therapi... |
Why don’t our ring fingers have the same mobility as our other fingers? | Because that is how humans evolved. Either there was never a mutation that lead to a separate muscle for controlling the ring finger, or maybe there was but it didn't give enough of an advantage that it propagated through the population. Maybe it did but there was some natural disaster that wiped out the population tha... |
Why does the WiFi signal get better as soon as you disconnect then connect back to it? | I'm not sure that's actually a thing. But if you are getting inconsistent wifi performance, you should check the wifi channel. There are a fixed number of these and if you are using the same channel as a neighbour it can cause issues when you are both using it. On my router I browse into the admin and there is an optio... |
why have planes stopped getting bigger? | Because there's absolutely no need for larger aircraft. The AN-225 was built to transport the then-Soviet Buran much like the American Shuttle Carrier Aircraft, which was a heavily modified 747, not out of any need for massive transport capacity. Only one was ever built. There are many disadvantages to large aircraft. ... |
What is happening in your stomach when you feel like it's "dropping" on a roller coaster? | Alright, I have to ask because I don't see it listed. I get this feeling in my skull and stomach. Am I feeling my brain sloshing around? I also tense up and get severe pounding headaches on rollercoasters so my wife thinks I'm a real killjoy because she loves them.Never understood this , I’ve never felt anything in or ... |
Why is it recommended to breathe in through the nose and out through the mouth when exercising? | Believe it or not, you only use a small percentage of the oxygen you breath in. By breathing in through the nose you bring air in slowly and at the same time your lungs are filling with CO2 to expel. By expelling the air through your mouth, you get rid of more CO2 faster. Usually when you start to feel out of breath it... |
How do archeologists know where to dig? | Not a general reply, but in certain Near Eastern contexts , major settlements from before the Greek period are obvious to the naked eye. People built houses and other walls primarily with mud brick, which is prone to erosion and collapse. When a mud brick house collapses due to erosion, destruction, or intentional leve... |
Why Isn't the Milk Way expanding as fast as the rest of the universe? Or Is it? | The Milky Way isn't expanding at all. On the scale of galaxies and even galaxy clusters, gravity is much stronger than the expansion of the universe, so everything stays together. It's only on *really* massive scales that we see expansion happening. |
Why do strongmen have more body fat & smaller muscles than bodybuilders but can lift heavier? | More calories for their muscles to use. When it's showtime for body builders they're leaning out and on super strict cutting diets. |
how do ICBM travel such long distance in short amount of time? Can they be intercepted? | ICBM's go super fast and super high. They use massive rockets to propel themselves at speeds that boggle the mind, and use this speed to traverse vast distances. They use gravity to ensure that they come down where they are supposed to. Can they be intercepted? Yes. Easily? No. Because of their speed, radar can have tr... |
Why do some dead batteries work again after you stop using them for a while? | It depends on what type it is. The simple answer is voltage recovery. Imagine going for a run. You run until you can't anymore so you stop. Even if you wait for only 5 minutes, you start to recover your energy and can run for a bit longer. I can go into the different battery chemistry types if you want? |
Why does animal camouflage, for the most part, not work on humans? We can often see what the camouflage is attempting to do, but we can usually spot an animal pretty quickly. | Can we? There's a bunch of confirmation bias, you only recognize the ones you spot and never realize the ones you don't see . Camouflage is extremely effective. That being said, there are some things going on. camouflage is a designed to work more at a distance and works best with nonmoving objects. Most of the things ... |
why is a chip on a credit card considered ‘safer’ than swiping the magnetic strip? | A *really* ELI5 explanation is that the chip effectively produces one-time card numbers that are only valid for single transactions, whereas a magstrip always produces the same card number. It's not quite that simple, but that's sort of the idea. Since the data produced by the chip card is only valid for a single trans... |
How Hong Kong could leave China? | > how can Hong Kong leave china? Same way the US left the Britain; armed revolution. > But what about the world? Of course, there are some nations like the USA or the U.K that will stand up for Hong Kong and its people but if they do that's a 100% chance they will have to go to war with China. The US and UK will do abs... |
How do celebrities, like OJ Simpson, who lose their fortunes still live seemingly lavish lifestyles? | If you're famous, you can often get a free ride or even get paid to show up at events or parties. Plus, rich and famous people have rich and famous friends. Shit, even some no name, not rich people can live a somewhat lavish lifestyle by knowing the right people. Look at Kato Kaelin. |
Why is the download of a software update 100 MB, but does it need 1 GB of free space to complete the installation? | Think about it like an inflatable boat. While deflated it takes up very little space and is easy to move around, but you can't really use it for its purpuse. But when you inflate it you can use it as intended.It might be highly compressed, and decompression takes up space, then it has to install which takes up more spa... |
Why are online password managers so much safer than writing passwords in a book that’s kept in a safe place? | It depends what threat you're defending against If you're worried about someone breaking into your house and stealing your banking information then a physical book is a bad idea and a password manager is better If you're worried about being directly targeted because you're a high value target then a password manager is... |
Why do airplane passengers need to turn off cellphones or electronic devices while a plane takes off/lands? | I would imagine that today the only good reason that they would want all the devices — phones, Ipads, laptops, etc. — turned off and put away, during takeoff and landing, is so that, if there were an emergency, they wouldn't go flying around the cabin and brain someone. |
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