Apparition -- A spirit in recognizably human form.

Data Loggers -- Digital data recorders that take continuous snapshots of environmental conditions, including temperature, dew point, humidity and EMF.

EMF -- Electromagnetic fields. High EMF can occur naturally in the presence of computer screens, cell phones or power lines -- and in homes with faulty wiring. However, sudden EMF spikes without electrical explanation can signal the presence of a paranormal entity.

Entity -- A spiritual being that may have been human once, but is no longer alive.

Era Cues -- Everyday Paranormal's theory that you can elevate paranormal activity from spirits of a certain era by presenting familiar stimuli.

EVP -- Electronic Voice Phenomenon, or EVP, refers to voices or sounds captured using digital audio recorders that can detect sounds below the threshold of human perception. In the paranormal world, under the correct conditions, these sounds are considered to be voices from beyond the grave. A "Class A" EVP is an EVP clearly audible and discernible on playback without digital enhancement.