Questions

Havana is the capital city of Cuba.

It's currency is Cuban Peso.

Bull market is that market where stock value are expected rise and people will have tendency to sell their stock so as to earn profit out of it. Thus sudden push from the suppliers will gradually niutalise the market.

Deleted files are not permanently removed from the hard drive or the computers memory. Before they are permanently removed from the system they are stored in Recycle Bin. Recycle Bin is a folder or directory where deleted items are temporarily stored. It is also called as trash.

Optical illusion is what that refers to persistence of vision with a principle that multiple images blend into a single image in human mind and what is showed in cinema.

Hence, Persistence of vision is the principle behind cinema.