U.S. Congress. Joint Committee to Investigate Dirigible Disasters, ca. 1933. Original public domain image from Flickr https://www.rawpixel.com/image/8799428/photo-image-vintage-public-domain-travelFree Image from public domain licenseAthlete wearing a smartwatch in the gym https://www.rawpixel.com/image/2107312/smart-watch-fitness-applicationView licenseMan having a sore arm https://www.rawpixel.com/image/2025343/man-touching-his-armView licenseCloseup of a smartwatch on a man's wrist https://www.rawpixel.com/image/2326271/premium-photo-image-accessory-alone-applicationView licenseWoman holding weed in hand https://www.rawpixel.com/image/1211791/woman-using-medical-marijuanaView licenseCloseup of a smartwatch on a man's wrist https://www.rawpixel.com/image/1224264/man-wearing-smartwatchView licenseHappy mature woman in underwear https://www.rawpixel.com/image/6199882/happy-mature-woman-underwearView licenseThe left and right knee-joints of Frank Burgess, probably a soldier in the South African War, after excision of the left… https://www.rawpixel.com/image/14015323/photo-image-person-hospital-public-domainFree Image from public domain licenseThe bones of a hand, viewed through x-ray. Photoprint from radiograph after Sir Arthur Schuster, 1896. https://www.rawpixel.com/image/14008661/photo-image-hand-person-public-domainFree Image from public domain license[Untitled photo, possibly related to: es jitterbugging in a juke joint on Saturday afternoon. Clarksdale, Mississippi… https://www.rawpixel.com/image/12248508/photo-image-people-public-domain-womanFree Image from public domain licenseJuke joint and bar in the Belle Glade area, vegetable section of south central Florida. Sourced from the Library of Congress. https://www.rawpixel.com/image/12247540/photo-image-face-people-public-domainFree Image from public domain licenseJointing operation. Pattern shop, Keystone Drilling Company, Beaver Falls, Pennsylvania. Sourced from the Library of… https://www.rawpixel.com/image/12284932/photo-image-person-pattern-public-domainFree Image from public domain license