Grandson, when I was born, there were no less than 2,005 times... Hum. One billion people, I think. Thank you calculator! In the world.

 

— How come my old grandfather makes such en error?

_{Note 1: people who instantly gets the knowledge tag will benefit from it a lot. You are several in this website to have it for sure. I think with more research from those who don't have it, you still can figure out the puzzle and that'd be even more impressive!}

_{Note 2: I believe it is possible that other answers apart from the one I thought exist. So I will only select the answer that matches mine, but feel free to post your tries as they'd could get +1 and a chance to be mine. That's why I added the lateral-thinking tag.}

Grandson, when I was born, there were no less than 2,005 times... Hum. One billion people, I think. Thank you calculator! In the world.

— How come my old grandfather makes such en error?

_{Note 1: people who instantly gets the knowledge tag will benefit from it a lot. You are several in this website to have it for sure. I think with more research from those who don't have it, you still can figure out the puzzle and that'd be even more impressive!}

_{Note 2: I believe it is possible that other answers apart from the one I thought exist. So I will only select the answer that matches mine, but feel free to post your tries as they'd could get +1 and a chance to be mine. That's why I added the lateral-thinking tag.}

Grandson, when I was born, there were no less than 2,005 times... Hum. One billion people, I think. Thank you calculator! In the world.

— How come my old grandfather makes such en error?

_{Note: people who instantly gets the knowledge tag will benefit from it a lot. You are several in this website to have it for sure. I think with more research from those who don't have it, you still can figure out the puzzle and that'd be even more impressive!}

Grandson, when I was born, there were no less than 2,005 times... Hum. One billion people, I think. Thank you calculator! In the world.

— How come my old grandfather makes such en error?

_{Note 1: people who instantly gets the knowledge tag will benefit from it a lot. You are several in this website to have it for sure. I think with more research from those who don't have it, you still can figure out the puzzle and that'd be even more impressive!}

_{Note 2: I believe it is possible that other answers apart from the one I thought exist. So I will only select the answer that matches mine, but feel free to post your tries as they'd could get +1 and a chance to be mine. That's why I added the lateral-thinking tag.}