Quadratic equations involves much more material than linear equations. Linear equations is to quadratic equations as a plane going forward on the runway is to the plane whose wheels have just left the ground. Another comparison is that linear equations is to quadratic equations as a river is to the ocean.
keywords: instruction, teaching, formulas, mathematics

The adage ‘It is only one step from the throne to the gutter.’ can be taken as an ordinary-language version of the theorem that a well-ordered set contains no infinite decreasing sequence.
keywords: Mathematics, analogy, bottom

– the ability to have a given email dumped to a word-processing document. (This way, I have access to it even when I don’t have internet access.)
keywords: technology, innovation, off-line access

(suggested new terminology)
To ‘leave by the back door’ can be used as an euphemism for ‘commit suicide’.
keywords: life, linguistics

‘jalapeno’ is missing from both Benson and Wells. (But is present in Vikivortaro, with a translation of ‘halapenjo’.)
keywords: errors and omissions, dictionary, dictionaries, Esperanto

Apple Classroom is more about class management, than actual teaching, whereas Google Classroom is more about actual teaching, than about classroom management. (So, they’re complementary.)
keywords: education, instruction

(suggested new terminology)
A live wire is one who gives responses before the cues. A zombie is one who does not give responses to the cues.
keywords: life, social psychology