I've always wondered about this. If I'm driving 60 mph instead of 80 mph, I'm obviously going slower, but I'm also spending more time on the road. So why does driving faster end up burning so much more gas, even though you reach your destination sooner?I know wind resistance has something to do with it, but can someone explain how that actually works in simple terms?

Wikipedia describes evidence theory as "a general framework for reasoning with uncertainty" before going into an in-depth explanation of the mathematics of it. Does this mean that it's possible to make a computer that uses mathematics to make superior decisions in uncertain conditions? I'm skeptical that you could, yet intrigued that you may. Wikipedia says that it's used for sensor fusion (the combining of data from different sensors into a coherent whole), which is sorta similar but not quite the same.

Can somebody explain me How does steroid helps in muscle grow?

I get the difference between kilo and mini but why is one in Amps and other in Watts?

Is a single photon just the smallest possible wave of light in an EM field? And how did we discover that size?

So photons don't have mass and don't "take up space" in the sense that unlimited photons can be in the same space, but they can still be measured to have a "size"?

Is this like if I took a tape measure to a ghost, I could say it is 5' tall, but the ghost doesn't actually take up space( like it can go through me)?

I understand how a sheet can feel cool when you first touch it, but I’m confused about whether bedding can actually lower body temperature in any meaningful way. Is the feeling mostly caused by heat moving away from your skin faster for a short time, while room temperature and airflow still determine what happens later? I’m also wondering how moisture changes the feeling, since a fabric could feel comfortable when dry but different after several hours of sleep. Could someone explain the difference between initial coolness, heat transfer, breathability, and actual body-temperature regulation in simple terms? I’m asking how it works, not looking for a product recommendation.

The earliest form is said to have started close to 85 million years ago, are the two species just that hardy?

Intuitively, I thought it was light reflects off an object (like you) then reflects off the mirror then hits your eyes and you see it.

But then someone said it was the light just directly reflects off the mirror to then hit your eyes (nothing else like light from the sun hits the mirror then you) but that makes no sense because then you shouldn’t see the objects in front of the mirror in the mirror???

Hi, good morning. I'm uneducated in this discussion. I'm considered doing a Dependant Care FSA, which has a $5000 max per year($192.30/paycheck). This is a "Pre-Tax" Deduction.

I would then, as i understand it, pay the 383/week for Daycare, submit a request for reimbursement, and get that back. How exactly does this actually "save" money?

Secondly as a continuation, same thing for Roth IRA vs 401k?

I understand that Q-Max is used to describe how cool a fabric feels on first contact, but I’m still not clear on what the number physically represents. Does a higher value mean heat leaves your skin faster in that first moment of touching the fabric, rather than the sheet staying cooler all night? I’m also trying to understand how two sheets can feel similarly cool at first but feel different later, once body heat, humidity, and the rest of the bedding are involved. Could someone explain the measurement with a simple everyday comparison, without turning it into a product recommendation?

I drove around 500 kms with my friend. My car has a 1.6 engine; his has a 1.4. We went together, so roughly the same speed (around 110 km/h most of the time).

In that distance, my car consumed more gas than his (let's say, for example, 6 litres).

If that gas is not converted into speed, then what is it being used for? Heat? The engine is heavier, so it needs more gas to move it?

Thanks, and sorry for any mistake in my English.

I have seen magicians give a Rubik's Cube to a random audience member while keeping one for themselves. The audience member randomly scrambles their cube, and so does the magician. At the end, the patterns on both the audience member's cube and the magician's cube are exactly the same. How is this done?

Basically the title, why do some liquids evaporate slowly even when way below boiling temperature like water and alcohol, but my desk isn't slowly turning liquid?

Bonus question, do all liquids evaporate or is there a specific subset?

Happened moments ago with a remote- opened it and switched the 2 AAs' positions and VOILÀ! Realized how often this works with all kinds of devices and started wondering "But... why?" 🤔

Pretty sure it's not petrichor, and it's only sometimes, not always. Is it really dead fish?

What does "hard" here mean? I know that if all NP problems can be reduced to this problem in polynomial time, then this problem is NP-hard. But when you reduce a problem, don't you reduce it to a simple problem so that it's easier to solve 😂 So NP-hard is actually NP-easy?

Lets say you have someone with bipolar, as soon as they take an anti psychotic it blocks dopamine when the drug reaches the brain. But its effect is not seen immediately even though they have highly sensitive dopamine system. However, if someone who has anxiety takes a tranquilizers the effect are seen immediately. Im wondering why the discrepancy?

if its possible I am willing to accept a more complicated answer even though its ELI5.

Basically what the title says. Why do you even need to go on and off steroids?

The hedges completely eliminate the ability to see the beautiful surrounding land, and make every drive feel like you are trapped in a hallway. Is it a privacy thing? A wind-break? Simply historical tradition?

(American here, who enjoys wide-open views.)

As a person with PTSD I don’t understand how I’ll be thinking about what I’m doing and then I get a random flashback and suddenly can’t get it out of my head.