Just the smell of rosemary can enhance overall memory, according
to a recent study. The amount of one of the main chemicals in
rosemary oil, called 1,8-cineole, can be linked to brain performance.
The more 1,8-cineole study participants absorbed into their
bloodstream, the better their performance on speed and accuracy
tests. Keep a plant on your windowsill or add a rosemary-oil
diffuser to your room.