In accordance with my commitment below, here are the ten ideas I came up with.
An introduction to real analysis using Python.
Gurren Lagann fanfiction where characters die left and right for being idiots. (Thanks chelz!)
Semi-realistic Solar System space opera. Moral horizon-hopping protagonist reclaims humanity's drive toward space.
An argument against mathematical platonism.
An explanation of the taxonomy of birds.
A follow-up to the quantum physics sequence.
A type theory-based explanation of tensor analysis and differential geometry.
An argument against the usefulness of Rawls' "veil of ignorance".
An essay on romantic aesthetics, using Rand as a starting point but blowing away her chaff.
A review/update of Buckminster Fuller's Critical Path.
An argument against mathematical platonism.
Yes please.
An exercise:
Name something that you do not do but should/wish you did/are told you ought, or that you do less than is normally recommended. (For instance, "exercise" or "eat vegetables".)
Make an exhaustive list of your sufficient conditions for avoiding this thing. (If you suspect that your list may be non-exhaustive, mention that in your comment.)
Precommit that: If someone comes up with a way to do the thing which doesn't have any of your listed problems, you will at least try it. It counts if you come up with this response yourself upon making your list.
(Based on: Is That Your True Rejection?)
Edit to add: Kindly stick to the spirit of the exercise; if you have no advice in line with the exercise, this is not the place to offer it. Do not drift into confrontational or abusive demands that people adjust their restrictions to suit your cached suggestion, and do not offer unsolicited other-optimizing.
To alleviate crowding, Armok_GoB has created a second thread for this challenge.