it's weird

okay..
I must present a presentation in front of class today..
but something weird..
I Can't find the slides that I had made it the day before..
I thought, maybe I saved it in my laptop, not in my USB..
I can make a new one anyway...

and finally,
I make a new slides...

But...
when I checked at home,
it's not in my laptop..
It's in my USB..
then, how come I can't find it in the afternoon??
so weird...
huff....