"You know these tiny travelers?" says Grandpa
"Billions of them! Born to travel. They have travelled to all continents, nations, and towns."
"But they always need help, a chaperone so to speak. And, it is almost always a one way ticket for them." Grandpa said.
"They love their countries and carry the name everywhere they go. A lot of people love them even when they are useless!"
"Is that all you are going to tell me?" I asked
"Well. If you insist, these devils started their travel mission in the 19th century England"
"And, sadly, most likely, the travelers will die in this century"
What was he talking about?