Can people in the sky receive short messages from the world?

People are dead and lifeless. How can we accept them? number

Burning paper for the dead is regarded as sending a letter, a kind of grief and a good wish of people.

From a scientific point of view, this is an impossible space and an unrealistic thing. The name written on the paper was burned to ashes by fire, and the name of the deceased was silently recited in people's hearts for the deceased to receive? This does not conform to the truth of scientific development. How can the dead enjoy ethereal things?