This one explains everything about Nostr in 20 seconds, and makes you want to buy it:

nostr:nevent1qqs8e8c69wwpt3yrjnaw2pnfw9d7ttxn3pg444z767t9jygfymldfacppemhxue69uhkummn9ekx7mp0qcdtrk

(or: what if the outbox model had a marketing budget)