Colombia is home to a 62-mile-long river called the Caño Cristales which reflects brilliant shades of different colors during a certain time of the year thanks to an aquatic plant that blooms red.
Though we can easily tell colors apart side-by-side, we have trouble remembering specific shades because our brains tend to store color memories as one of just a few basic hues.
Engineers have developed a new material that stays liquid more than 200 degrees Fahrenheit below its expected freezing point, but a light touch can cause it to form yellow crystals that glow under ultraviolet light.