GREAT Visual of the Electromagnetic Spectrum. While light and other electromagnetic waves do not require a medium and can travel through a vacuum, they can travel through some media, such as clear glass.
Travel Journaling Guide - Part 4: Make Journal Notes
Take notes for your journal as you travel. That way you don't have to worry about losing time, and you also get to remember all of the memories! Travel Journaling Guide - Part 4: Make Journal Notes - Creative Passport #traveljournal #traveljournalideas