But snow has a scent, and researchers say that scent depends on what’s in the ground and the air. And as both the atmosphere and the land are getting warmer, the scent of snow is getting stronger.

Johan Lundstrom, a professor of clinical neuroscience who describes himself as a “smell researcher” at Monell Chemical Senses Center in Philadelphia, said because snow’s smell reflects the impurities in the air, the flakes in Wisconsin smell different from snow in Sweden, and from snow in a city.

— Read more in Climate change is altering the smell of snow at The Washington Post.

The notion is that perfume has the power to take you back in time and to evoke better, more cheerful memories. Whether you consider yourself spiritual or not, you might've heard of a similar idea: regression therapy. According to expert healer Kim Alexis, this is a relaxing and hypnotic experience whereby individuals are allowed to sense, feel, hear and see situations from another time and place. It's said to help people face mental, emotional and physical issues. The idea of using fragrance to unlock positive reminiscence might not be too dissimilar.

— Read more in I Tried ‘Perfume Regression’ To Feel Good Again & It Actually Worked at Refinery29.