One of the most beautiful things in mathematics are theorems of conjectures that are very simple to state and understand (e.g. for K-12, lower undergrad levels), but extremely hard to prove.
This is in contrast to conjectures in certain areas where you'd have to study for a few months just to precisely understand all the definitions and the interest of the problem statement.
Rat by Ciro Santilli 37 Updated 2025-07-16
Since rat and mouse are not scientifically specific names, we'll just use them interchangeably.
When one specific species is implied, we will mean Mus musculus by default.
Bat by Ciro Santilli 37 Updated 2025-07-16
As of 2020, account for about 20% of the known mammal species!!! www.sciencefocus.com/nature/why-are-there-so-many-species-of-bat/ mentions some reasons:
  • they can fly, so they can move out further
  • their eating habits are highly specialized
Mount Liang by Ciro Santilli 37 Updated 2025-07-16
The term "Mount Liang" generally refers to both the mountain and the surrounding marshy areas.
The novel always uses the term "梁山泊' (liang2 shan1 po1) to refer to the place.
Video 1.
How did the Liangshan ponds form? by CCTV (2019)
Source. Chinese only, but still fun to see the real place.
Lu Zhishen by Ciro Santilli 37 Updated 2025-07-16
Early on, he's usually called by others as Major Lu (魯提轄).
His original name is Lu Da 魯達
He then receives the Buddhist name Zhishen (智深, profound wisdom) during conversion.

There are unlisted articles, also show them or only show them.