Microretirement refers to taking a chunk or multiple chunks of time off work to experience life and travel while you're young, rather than waiting until actual retirement age in your 50s or 60s. It's similar to a sabbatical, and has also been dubbed an 'adult gap year'.

Tiger parenting is a rigorous, high-expectation style of parenting that prioritises discipline, academic achievement, and hard work, frequently linked to East Asian cultures.

In most countries, children in primary and secondary school are sorted into classes based on their age. 'Academic ability' refers to the knowledge of the students, their academic results and level of engagement with the material being taught.

Congestion pricing is a system where drivers pay a fee to enter certain high-traffic areas, usually in major cities, to reduce congestion and pollution.

World X is a world inhabited by only one group of people. In this world, there is no existence or development of science and technology. The people have basic food security, there are no climate change-related disasters, and there is no war. The inhabitants here adhere to one type of culture, the same religion, the same language, and the same race.