That Wasn't In My Textbook chases the history that classroom syllabi skipped, and tells it through slang, side comments and a steady supply of statistics. The episodes here follow two lines. Some trace ordinary rituals back to where they began. Others recover Black history that popular retellings pushed to the margins. The history of New Year's resolutions opens on a grim follow-through rate that gets graded, bluntly, as an F, then heads back about 4,000 years to the Babylonians. That episode leans on the word records: the Babylonians get the credit because their promises were written down, and the episode is sure other ancient civilizations and Indigenous groups were making the same kind of vows. A companion piece on the fresh start effect has Toya reading the Harvard studies so the listener does not have to, then walking through them one at a time, starting with Google searches for 'diet' that climb at the start of each week, month and year. The Black history thread runs through guest conversations and solo episodes alike. Historian Zaron Burnett, host of the Black Cowboys podcast, calls Bass Reeves one of the greatest lawmen in American history and traces the Lone Ranger back to his legend. That episode's cold open cites a scholarly estimate that one in four working cowboys of the westward-expansion era was Black, then notes that some historians think even that undercounts, since the figure came from an 1800s census taken during slavery. The surfing episode moves the story to Africa, where canoe surfers handled imports and exports for roughly five centuries. It also stops on a question the show keeps circling: why a practice only seems to enter history once a European writes it down. Tax law professor and author Dorothy A. Brown carries the thread into policy, in a conversation about how tax law and racism work together, a pairing the episode admits almost nobody thinks about, the interviewer included. The show treats its archive as something to reopen when the calendar calls for it. Rewind episodes bring earlier installments back on cue: the taxes conversation on April 15, the cowboys episode amid the buzz around Cowboy Carter. Closings point ahead to episodes on hookah, the Chinese New Year and the science of procrastination. The register is warm and unguarded. A rueful tax-day aside about a hard year slips in, as does the occasional mild curse. Many episodes lead with a 'fun fact', and every closing heard here lands on the same line: knowledge is power. For a first listen, the Black cowboys episode shows the guest-conversation format, and the fresh start effect episode shows how the solo episodes turn dense research into plain talk.