Grace Hopper kept a backward-running clock on her office wall as a daily reminder to dismantle the mindset of “we’ve always done it this way.” This deep dive follows the fiercely curious child who dismantled seven alarm clocks into a United States Navy Rear Admiral and a foundational legend of computer science, tracing how one person figured out how to teach machines to understand human beings.

From a Latin-score rejection at Vassar to bypassing the Navy’s age, weight, and occupation barriers, Hopper repeatedly analyzed rigid systems and engineered a way through. She programmed the room-sized Mark I, proposed the radical idea that programming should use English words, and built the first compiler, work that led to COBOL and reshaped who could participate in computing.

• The real story behind the 1947 “bug” in the Harvard Mark II relay and why the term predates her
• Building the A-0 compiler after being dismissed for three years by skeptics
• How COBOL grew from her Flow-Matic work into a backbone of business computing
• A retirement repeatedly interrupted as the Navy kept recalling her to active duty
• Her teaching props: 11.8-inch “nanosecond” wires and packets of pepper for picoseconds