caption: Magnets More than 2,000 years ago <PERSON> discovered deposits of a mineral that was a natural magnet.
exif: {"Image DocumentName": "Magnets More than 2,000 years ago Greeks discovered deposits of a mineral that was a natural magnet.", "Image ImageDescription": "The mineral is now called magnetite. In the twelfth century Chinese sailors used magnetite to make compasses that improved navigation.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}