After that long "polar vortex" winter, spring is finally here, but it's brought along a sneeze-inducing menace: Pollen. You would think that a cold winter would reduce the amount of pollen in the spring, but as this video explains, the opposite is what really happens.

Learn more about the science of pollen season and what you can do for relief.

Related on MNN: How to survive pollen season (without locking yourself inside the house)