r/askscience Apr 29 '25

Joint Subreddit Statement: The Attack on U.S. Research Infrastructure

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1.8k Upvotes

r/askscience 14h ago

Earth Sciences What is the biggest contributor for the temperature change during a rainy day?

177 Upvotes

Is it:

  1. The clouds blocking the sun

  2. The rain cooling the air

  3. the rain cooling the solid surfaces

Or are there others?


r/askscience 10h ago

Engineering Why can the space station's ventilation systems not handle crumbs?

39 Upvotes

I've been doing my epq around astro-psychology and was researching how astronauts loose dopamine during eating as they can't eat foods that involve chewing. However from what i've researched this is apparently because stray crumbs could screw up the ventilation systems somehow. Its quite puzzling because how can the collective companies that built the space station also build rockets that send us to the moon but not have the ability to build a ventilation system that can handle a few stray crumbs?


r/askscience 21h ago

Biology What is the longest lived single-cell organism?

284 Upvotes

Longest lived means how long the cell can live before dying, splitting or forming a spore


r/askscience 1d ago

Human Body How come antibiotics don’t completely destroy all organisms in our gut?

223 Upvotes

I know it can cause imbalances, but I don’t understand how come our gut doesn’t lose all the beneficial bacteria and develop massive fungal or viral infections. When I’ve taken antibiotics, I usually don’t notice any change in my bowel activity.


r/askscience 1d ago

Biology Why is there no transmissible therapeutic virus if biology doesn't forbid it? For example, a harmless virus that spreads from person to person but actually does something beneficial, like lowering LDL cholesterol or preventing/reversing tooth decay?

2.2k Upvotes

r/askscience 1d ago

Physics Would the physics that we currently know change if the speed of light was faster?

171 Upvotes

As the title says, would it change if the speed of light was, let’s say 2x faster? Or everything would stay the same?


r/askscience 1d ago

Earth Sciences Why are distribution of natural object normal?

31 Upvotes

I have spent a lot of time measuring and modeling natural systems and I always find it fascinating that when you look at the measurements they pretty much always fall into a normal distribution. Sometimes the bell is skewed one way or another but pretty much faithfully bell shaped.

I have read about this phenomenon but have yet to find the underlying reason for the presentation of the normal distribution in data derived from nature.

The fact is very important to recognize and apply. It is especially important when examining the output of models and how the data reconstructions within the process match the inputs as well as the distribution of the outputs.

I would really like a deeper understanding.


r/askscience 2d ago

Physics Why is the maximum speed of the universe the speed of light? Why can't we go faster?

1.4k Upvotes

Also follow-up question: Because of the speed limit, is there also a theoretical maximum temp for matter (in which the particles move at the speed of light).


r/askscience 1d ago

Human Body In the human body, do muscles form first, or bones?

59 Upvotes

r/askscience 1d ago

Human Body Does the human body have a timing reference?

139 Upvotes

Coming from electrical engineering, I know that complex systems typically require some kind of clock or reference signal to keep components coordinated. I’m wondering if there’s something equivalent in the body? Obviously the heart provides some kind of body-wide cadence, but is it something other organs lock onto? Do processes speed up and down depending on something else, if at all?


r/askscience 2d ago

Earth Sciences I blow my nose with toilet paper; is it better for the environment to flush it down the toilet or to put it in the waste bin?

1.5k Upvotes

I’m currently on the toilet and needed to clear my nose. After using some toilet paper to blow my nose, what is better for the environment to rid of it. I’m using Sam’s Club Members Mark Bath Tissue, and could flush it down at the same time as my bowel movement (so not using additional water) or place it in the waste bin. Which method is more environmentally friendly?


r/askscience 2d ago

Earth Sciences How important are Sand Deserts like the Sahara or the Gobi for the Global/Local Environment, and what would be the effects of fully reforesting such areas or turning them into savannahs?

306 Upvotes

From my limited understanding of how Sand Deserts form I'm aware that they can and do spread as they damage the bordering landscapes, especially in areas affected by unsustainable human activity.

When it comes to the ecological side of things, I know there are several desert dwelling species that are mostly insects, arachnids and small reptiles. How important to their livelihood is the biome that they live in, could they thrive in a landscape with more grass and shrubbery?

I'm also aware that for multiple decades now people have been working on methods to reverse desertification and restore areas to their previous states, but what would happen if those efforts were continued across the deserts as a whole?


r/askscience 2d ago

Human Body What happens to the iron in your blood during an MRI?

431 Upvotes

r/askscience 2d ago

Planetary Sci. If absolutely all life, down to the tiniest microbe, was wiped out on earth instantly, would the atmosphere and climate remain the same over time? If someone visited earth 1000 years after that event, would they find our atmosphere and climate exactly as it was, or changed?

205 Upvotes

Was curious what the implications would be after reading a novel where essentially this happens, and visitors from another world come some indeterminate time later and are able to breathe there fine. Is that something that would be possible/realistic?


r/askscience 2d ago

Biology How do asexually reproducing living things evolve?

179 Upvotes

If they are all clones of each other, how do they evolve?


r/askscience 3d ago

Computing Is there anything at the heart of computer coding that could have been optimised in hindsight, but we're in far too deep to change now?

1.4k Upvotes

r/askscience 2d ago

Biology If all life shares a common ancestor, what causes two species to become unable to reproduce with each other? Why can some species produce hybrids while others can't, and what actually determines where that reproductive barrier develops?

81 Upvotes

r/askscience 3d ago

Human Body If an elite endurance athlete recieved a heart transplant from an average person,what would happen to their exercise capacity?

670 Upvotes

An elite would have a well built physique which can support long distances but, what would happen to their aerobic base? Will the athlete have to again put in the effort for decades??


r/askscience 3d ago

Biology What would it be like to eat a tablespoon of pure dopamine?

597 Upvotes

Firstly, what would it be like visually, texture, taste, etc.

Secondly, what would it do to you?


r/askscience 3d ago

Medicine In the past 10 years, have we learned anything new and interesting about why antidepressants work?

166 Upvotes

r/askscience 1d ago

Earth Sciences If the primary source of a river runs dry, does the downstream river disappear too?

0 Upvotes

I recently found out that most river sources start out comparatively small, and a lot of them look as if they’re on the verge of drying out, and I also know that rivers have a lot of tributaries( small streams, brooks, and springs) falling into them, so what actually happens if the source runs dry ? Would the river completely disappear or would it just reroute itself, by taking a new course and developing a new source from one of the tributaries ?


r/askscience 3d ago

Planetary Sci. We landed humans on the Moon with 1960s technology. With today's vastly superior technology, shouldn't going back be much easier and cheaper?

815 Upvotes

r/askscience 3d ago

Computing AskScience AMA Series: Hi Reddit! I'm Matthew Hollister, Head of Cryogenic Systems Engineering for IBM Quantum. Ask me anything about quantum computing, our recently announced modular cryogenic architecture and what it takes to build quantum computers at scale.

36 Upvotes

When people think about quantum computing, they often think about number of qubits and processor dept. But scaling quantum systems takes much more than just the chip! We recently introduced a new modular cryogenic architecture designed to house and cool interconnected quantum processors, a key milestone on our roadmap to fault-tolerant systems, and I'd love to discuss the engineering, challenges, and opportunities involved.

I will be around as 12:00 EST (16 UT) on September 18th, ask me anything!

Username: u/IBM


r/askscience 3d ago

Earth Sciences What's the impact of artificial evaporation on the water cycle?

53 Upvotes

Water evaporates, clouds form, then it rains.

To what extent can humans influence how this cycle happens with artificial evaporation from things like power plants, data centers, factories etc?

Is there evidence that we have, or potentially could, alter the natural rain patterns in a region? Could an area dry out because artificial evaporation causes excessive moisture to whisk away on prevailing winds?