reddit/learn

askscience

AskScience AMA Series: Happy World Breastfeeding Week! We are human milk and lactation scientists hailing from a range of clinical and scientific disciplines. Ask Us Anything!

451

10min

AskHistorians

How do we know there arent even older civilizations that have been erased from history?

714

1min

YouShouldKnow

YSK to lose weight, fill up with foods low in caloric density and high in fiber, like fruits and non-starchy vegetables. This can trigger satiety without the overload of calories and is more sustainable than going hungry.

12131

1min

explainlikeimfive

ELI5: Why is it so impossible to get accepted into medical school when there is such an insane shortage of family doctors?

4612

1min

YouShouldKnow

YSK: You do not need a pelvic exam before getting birth control, and if your doctor says so, stop seeing them

8136

1min

YouShouldKnow

YSK the more and less common warning signs someone may be struggling with an eating disorder

641

7min

AskHistorians

What is the best word I can use to describe why a person was jailed when their offense is no longer considered criminal today?

1363

1min

explainlikeimfive

ELI5: When people get scammed and money is transferred out of their bank, why isn't there a trail to easily find the scammer? If the money is transferred into some foreign country that won't allow tracing, why dont you get a notification of sus activity before the transaction goes trough?

1650

1min

YouShouldKnow

YSK Nissan transmissions are notorious for mechanical issues

2322

1min

explainlikeimfive

ELI5: why does time dilation work? Using this intuitive example.

1412

1min

explainlikeimfive

ELI5: Why is eating/drinking some curdled, moldy or fermented food/drink safe but not others?

672

1min

AskHistorians

When did humans stop accepting brutality as an aspect of life?

1701

1min

explainlikeimfive

ELI5: How do blind people see nothing and not black?

412

1min

Documentaries

Recommend a Documentary!

298

1min

YouShouldKnow

YSK: Your Internet Habits Impact What You See In Search Results

818

2min

explainlikeimfive

ELI5 why can’t homes or buildings have a sunshade or second roof above them to shade the buildings and cut cooling costs.

656

1min

askscience

AskScience AMA Series: I'm Hayley Tsukayama, tech journalist and data privacy advocate. I research how your data is used on the internet. AMA!

290

1min

YouShouldKnow

YSK that you can literally dream, think, or be scared of or have anxiety about ANYTHING and it doesn’t mean that necessarily means something.

3009

1min

AskHistorians

Was Hitler’s military really so superior to other European countries or was the blitzkrieg so successful because proNazi politicians set the groundwork for each country to quickly capitulate?

787

1min

YouShouldKnow

YSK that "it's not the volts that kill, it's the amps" is oversimplified and should not be taken as safety advice.

4235

1min

explainlikeimfive

ELI5: How did a few months of economic shutdown due to COVID cause literally everything to be unaffordable for years?

2112

1min

askscience

Which birds have hollow bones? Did dinosaurs have hollow bones?

350

1min

YouShouldKnow

YSK: Disposable vapes, otherwise known as bars or pods, sometimes have parts substituted out for other materials when experiencing shortages. These substituted materials are often subpar or dangerous.

1771

3min

history

Weekly History Questions Thread.

39

1min

explainlikeimfive

ELI5: For pilots, why is flying on IFR ("Instrument Flight Rating") so difficult? Can't a pilot just focus on their instruments and stay oriented and on course?

1560

1min

YouShouldKnow

YSK: Extra Principal Payments on Loans

1114

1min

YouShouldKnow

YSK: You don’t need a “all or nothing approach” to be healthy and have muscle definition.

3379

1min

explainlikeimfive

ELI5: Is every logically deductible mathematical equation correct and not open to debate?

450

1min

askscience

AskScience Panel of Scientists XXVI

126

3min

YouShouldKnow

YSK that there are good things happening on a global scale, too.

1010

1min

explainlikeimfive

Eli5 : Why don’t we use hex bolts on everything ?

1326

1min

philosophy

/r/philosophy Open Discussion Thread | July 08, 2024

26

1min

askscience

Ask Anything Wednesday - Engineering, Mathematics, Computer Science

112

2min

askscience

Ask Anything Wednesday - Physics, Astronomy, Earth and Planetary Science

127

2min

YouShouldKnow

YSK service animal and emotional support animal registries are scams (USA)

1118

3min

explainlikeimfive

ELI5: why doesn't the fire spread into my lamp??

684

1min

AskHistorians

Did women have duels topless out of fear that fabric being pushed into a wound would cause an infection, while this was not a concern for men?

874

1min

askscience

AskScience AMA Series: I am a planetary geologist from the University of Maryland, and I recently operated a simulation to help astronauts prepare for the moon. Ask me your moon-related questions!

153

2min

explainlikeimfive

ELI5: Why do medical bills start so high just to end up mostly written off when they’re processed through insurance?

300

1min

YouShouldKnow

YSK Grapes And Raisins May Be Deadly For Your Dog

1675

1min

AskHistorians

In "Much Ado About Nothing," Benedick says that he'll "go get [Beatrice's] picture." How would he go about doing that?

220

1min

explainlikeimfive

ELI5: If the SR-71 Blackbird flies at top speed, highest altitude, straight and level, does escape velocity naturally pull the plane down forcing it to follow the curvature of the Earth?

616

1min

AskHistorians

Why didn't people move "again" after The Great Migration (USA)?

111

1min

explainlikeimfive

ELI5: Given the importance of planned weaknesses in cars, like crumple zones, how do armored/state cars that don't have these features remain safe in the event of a crash?

579

1min

explainlikeimfive

ELI5: How did the USA become so culturally significant?

331

1min

AskHistorians

How prevalent was sexual assault against men in wartime during the medieval era?

33

1min

askscience

How does the Coriolis Effect prevent the Earth from having a single Hadley Cell?

44

1min

YouShouldKnow

YSK: Liberal Arts College is not just Humanities majors

645

2min

AskHistorians

In fantasy media, you commonly see the trope of a big city with huge stone walls totally surrounding it. Is this realistic?

507

1min

askscience

How much of astronomy could be rediscovered by somebody with just a telescope and camera?

14

1min

AskHistorians

Was the "War is a glorious adventure" narrative before WW1 dreamed up out of whole cloth?

158

1min

explainlikeimfive

ELI5: Can an electric vehicle drive underwater?

238

1min

YouShouldKnow

YSK that fidget toys don't have to be just "for children". I keep hearing how fidget toys are a kids thing, and that adults don't use fidget toys. They can, and they should more often. I think the term "fidget" just has a negative connotation after the "fidget spinner debacle" of 2015...

726

1min

askscience

Can someone help me understand electricity more?

20

1min

explainlikeimfive

ELI5: why do babies cry so much

156

1min

AskHistorians

Did Chinese peasant children really have no names?

426

1min

AskHistorians

Was the Soviet Red Army of the Cold War years actually a major threat, or just a paper tiger?

251

1min

YouShouldKnow

YSK that your cat's water and food bowls should be kept in separate areas of your home

87

2min

AskHistorians

Is it possible that a Large, ancient civilization has not been discovered due to another civilization "erasing" them from History?

140

1min

explainlikeimfive

ELI5: How and why did Western nations start collecting green waste like grass clippings from homes?

92

1min

AskHistorians

Were same sex pairings between similarly aged partners the norm in any cultures?

505

1min

explainlikeimfive

[ELI5] if a (relatively) small black hole is orbiting a more massive black hole, as they eventually merge, would the matter be drawn back out of the singularity of the smaller?

111

1min

AskHistorians

In the past, how often did people in arranged marriages NOT consummate the marriage on their first night?

244

1min

AskHistorians

Did the Hundred Days stand any realistic chance of restoring Napoleon to power long-term?

181

1min

explainlikeimfive

ELI5: The golden ratio

69

1min

AskHistorians

I recently found out that Muslim Spain recruited soldiers almost entirely from sub-Saharan African populations. The same was true for medieval caliphates in North Africa and parts of the Middle East. What was it about sub-Saharan African soldiers that made them the ideal recruits for Muslim rulers?

95

1min

AskHistorians

Have there ever been weapons capable of cutting a head or a limb in one swift move like you see in movies?

74

1min

AskHistorians

Office Hours August 05, 2024: Questions and Discussion about Navigating Academia, School, and the Subreddit

13

1min

AskHistorians

How did Mexican Spanish come to be considered a "standard accent," at least in the US?

38

1min

AskHistorians

Did the nazis think that nuclear research was somehow 'Jewish'?

80

1min

AskHistorians

Why does it appear that handguns underwent widespread modernization faster than rifles in the 19th century?

93

1min

AskHistorians

Was the US South really trying to take over the world?

64

1min

AskHistorians

I just finished reading The Wager by David Grann and was surprised to learn from it that many of the sailors aboard that vessel couldn’t swim. How common was this during the Age of Sail?

87

1min

AskHistorians

Was there anti-Jewish sentiments in Poland after WWII, and if so, was this due to the borders being redrawn?

14

1min

AskHistorians

England had decades without major wars, for example 70 years between the Second Baron's War and the Hundred Years War. After this time, how did people know how to conduct the logistics of warfare?

141

1min