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rtlt
'rtlt' - used as a noun
1. the elapsed time it takes for a signal to travel from Earth to a spacecraft (or other body) and back to the starting point
Variations of 'rtlt'
 
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Fact of the day
Prosopagnosia refers to the inability to identify people by their faces. In severe cased prosopagnosia a person may not be able to identify themselves in a mirror.