Interest Stacks

First responder, some emergency knowledge, don't leave regrets behind

Second Punic War: between Rome and Carthage (218 BC - 201 BC)

There might be slight changes by the author compared to the history, but a lot of it seems legit.

Tennis, elaborated explanation

German language
(This is the sequel in the Blue Giant manga series)

Baseball

Astronomy (15th century Poland) & how it was seen as heresy at the time
(Earth central vs Sun central etc.)

Modern Japanese history (1923-1989): Memoir

French Revolution (~1787), some basic French words

(The "chair winding" scene was inaccurate, you'll see what I mean when you get there.)

Doctor, medical

Medical: about issues to the heart and thorax (= what's being protected by the ribcage)

Medical (diseases and accidents + how to treat or solve)

Medical (need to read further to make sure)

Physics, mathematics, industrialization of a parallel world (isekai).

Not everything is trusted but for example Pythagoras' theorem (a²+b²=c² ; regarding perpendicular triangles and the lengths of their sides) and other physics applications such as air balloons hot air & cold air mechanics (Ch 112) are little fun facts.

Even some tiny details as DHA in fish (essential unsaturated oil which the brain craves for development) (Ch 116).

Modern medicine (2000) and surgery brought into the Edo period (late 1800s).

Very educational about the infectious diseases with an enormous impact, such as the measles and cholera.

Information about the countries they pass through travelling from east Asia to Egypt.
-Singapore
-India
-Pakistan
-Egypt

(forgot which ones but there are a couple more)

Slavery in the times of the Roman Empire, history on the emperor Nero, his mother Agrippina and his half-brother Britannicus (~Ch 150)

Intellectual understanding and explanation of military tactics and clever schemes.

Also Chinese history but idk how much of it can be traced back to that time.

French pastries and some extra French vocabulary

A large variety of medical terminology is shown in separate bubbles.

Investing advices

Animal forensics, post-mortem analysis, animal behavior

Football (soccer)

Gourmet: Japanese foods (lots of variation)

Manchuria, 1930s
Effects of opium usage and addiction, as well as its preparation such as purification.

Culture of the multiple races in the setting (Japanese, Chinese, Mongols, Russians...)

Hospital work of an anesthesiologist, different anesthesia (sedation on the operation table/seat), learning about the human body

Medical (such as surgery, but also other parts of biochemistry and anatomy), hospital environment.

This manhwa has some really educational stuff that I think is overlooked by many (due to its difficulty of terminology and concepts);
such as in Ch 31 with the graphs and different critical parameters of a patient who might need to undergo intensive care;
Ch 67: blood pH of 7.2 (= the blood contains more acids compared to normal) is dangerous because if it leaves the margin of about 7.35-7.40 toxicity may be severe: it might seem not much but that's subjectivity which can place the patient in danger: leaving that small safe range makes the blood more prone to quick fall or rise of the pH.

More info about this manhwa: see
=> https://xss.now.cc/forum/?topicid=2063127 = focus upon everything I can to explain what's happening to the best of the shared knowledge of my pharmaceutical studies and the internet, since it really really is a treasure chest to be opened and savored.

Strategies of marching bands (Ch 3,4)
Music (i.e. trumpet)

Fitness, weight lifting, correct form

Ballet terminology; also about a certain disease prominent to elders (not gonna specify due to spoilers)

Music

1st century AD in Italy (Roman Empire): ~Eruption of Vesuvius (79 A.D.)

Firefighting & Rescue (there are supernatural elements, but it's clear what's fantasy and what's real)

Culture of Tibet in the present

Pediatric surgeon: surgery for young patients: children (more dangerous than on adults):

!!! smaller tissues, organs, blood vessels; less blood so bleeding causes quicker problems to the heart or supply of oxygen to the tissues/brain

Psychology, psychiatrist
Common mental disorders and how to treat them.

Ballet

Plants, vegetables, harvesting, cooking

Surgery and anatomy
Also tetanus and cholera are part of the storyline.

Dunno how much of the acupuncture is correct but it has uses yeah.

Chapter 2: CPR (15-30 chest compressions + 2 breaths and repeat). Check consciousness by tapping shoulders and talking to the person. If there's an AED nearby, ask someone to bring it. Call 911/112/119 or another emergency number asap!!

Medical

Culture of Tibet in the 18th century

How to deal with lies and liars. (Note: MC can hear lies and truth, but it offers quality content even with that OP ability.)

Lying is not per se bad! Mostly it is used to keep secrets.

However it is up to their details and your feeling to judge whether it is a lie meant to be good or bad.

Japanese occupation of Korea in the 1900s (~1920), the cruelty and inhumane acts, the fighting for freedom

Apparently Japan had annexed Korea in ~1910, forced the Koreans to change their lives to (serve the) Japanese in many different ways, and in ~1919 resistance began to erupt, causing armed violence from both sides.
In ~1945 (after WW2) Korea was declared independent from Japan.

March 1 is the Korean national day:
"Korean nationalists formally declared Korea’s independence from the government of Japan on March 1, 1919."
-University of Central Arkansas | Political Science: 4. Japan/Korea (1907-1948)

More info:
=> https://www.history.com/news/japan-colonization-korea

History of high heels, famous creators, measurements