In 1981, engineer Rod Canion left Texas Instruments and co-founded Compaq, which created the first IBM-compatible personal computer. This opened the door to an entire industry of PCs that could run the same software. PLUS in our postscript "How You Built That," how frustrated renter Melanie Colón created an easier way to communicate with noisy neighbors, called Apt App. Learn more about your ad choices. Visit podcastchoices.com/adchoices