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Make a ghost detector. [https://www.youtube.com/watch?v=oA5cuLMHIsY] | Make a ghost detector. [https://www.youtube.com/watch?v=oA5cuLMHIsY] | ||
== Nonstandard photography == | ==== Nonstandard photography ==== | ||
"Many types of light have frequencies too high or too low for the human eye to detect. [...] A number of specialized photography techniques have been devised to work with different light frequencies to make the invisible visible." (Delton T. Horn) | "Many types of light have frequencies too high or too low for the human eye to detect. [...] A number of specialized photography techniques have been devised to work with different light frequencies to make the invisible visible." (Delton T. Horn) | ||