Correction from last time – HVAC – Heating, Ventilation and Air Conditioning. Thanks Tim! (no, really) History 1975 – First self contained digital camera. 100px by 100px (0.01 megapixels) – By who? Any guesses? CCD sensor. Took 23 seconds to record an image 1981 – Sony Mavica camera. 0.72mp....

1932 Jay B. Nash  “Within our grasp is the leisure of the Greek citizen, made possible by our mechanical slaves, which far outnumber his twelve to fifteen per free man… As we step into a room, at the touch of a button a dozen light our way. Another slave sits twenty-four hours a day at our...

Authentication vs. Authorization One-factor, “something you know” Cleartext, hashes, salts Entropy, complexity https://xkcd.com/936/ Two-factor, “something you have, something you know” Tokens, sms, totp Back them up! Authy will do this for you. Good/bad practices Don’t use things that can...