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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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To wear your heart on your sleeve isn't a very good plan; you should wear it inside, where it functions best. - Click here to find out.
Fact of the day
Frogs do not need to drink water as they absorb the water through their skin.