What are you into? pick any — or none for everything
What kind of hard do you like? the binding constraint
How far should your team get in a semester?
Which workbenches do you want to work at? the systems the problem engages — optional, skip if unsure
Confidence: high = Tier-1 source (a primary expert source — the agency's own report, the paper itself), fully fact-checked · medium = Tier-2/3 source (analyst, conference, or community source), fact-checked · needs sourcing = flagged for deeper sourcing — help us source this. The dot's size is its tier; a dashed dot needs sourcing. Structural cousins are problems in other fields that share this one's deep structure — the cross-domain link the genome is built to reveal.