Imagine a big bucket of water with a tiny tube connecting the bottom back to the top. Would the water keep moving, or would the circulation eventually stop?
I read that glucometers use a small electric current to detect glucose in a drop of blood. How does this actually work? How does the meter turn that tiny electrical signal into a glucose reading, such as 100 mg/dL?
A 20-inch screen always has a 20-inch diagonal. But what decides the angle between the two diagonals, or the screen's shape? How is the height calculated if the diagonal never changes? If two TVs both have a 20-inch diagonal, what prevents one to be be taller and another wider? What determines the screen's height?
I recently found out that airplanes use 400 Hz power instead of the 50/60 Hz used almost everywhere else. Why is that, and why isn't 400 Hz used more widely outside aviation?
I know that in many places there's water underground at around 100–200 feet (or even shallower). If the ground has water beneath it, how can massive skyscrapers and other heavy buildings safely support all that weight? Why don't they sink, tilt, or collapse over time?
How the cut parts unite together or healed? What sort of healing is that? How the micro channels of xylem and phloem get connected from both parts.
There are a number of files like these that keep on adding in storage. How to stop these files adding in storage?
At the gym, I often realize a woman's leggings became see-through during certain movements. Would it be more respectful to quietly let her know, or is it better not to say anything?What's the social etiquette here?
What prevents an airplane's black box automatically sending all its flight data to the cloud while the plane is flying, or immediately after a crash? Why do investigators still have to recover the actual black box?
I know traditional TV broadcasts don't work the same way as the internet. How have people managed to interrupt or replace TV signals and what makes that possible?
I've noticed that hearing certain songs can instantly bring back vivid memories or emotions. What happens in the brain that links music with memories, and why can some songs trigger them so strongly?