A brainteaser is something (such as a puzzle) that demands mental effort and acuity for its solution.
I enjoy brainteasers.
Here is one for you:
What do the following dates have in common?
- November 8, 2016.
- November 6, 2018.
- November 3, 2020.
- January 5, 2021.
- September 14, 2021.
Tease your brain and let me know your answers! But remember you have to use your brain in order to tease it properly!!!
They're all dates when some kind of election was held, though Lin may be referring to something more specific about those elections.