2. How do we smell? Dogs have 1 million smell cells per nostril, and their cells are up to 100 times larger than those of humans. Actually, how and why we smell is still inadequately known. There are many theories about the exact process of our sense of smell.
3.
4.
5. What are pheromones? The term "pheromone" was introduced by Peter Karlson and Martin Lüscher in 1959, Greek word pherein (to transport) hormone (to stimulate). These chemical messengers are transported outside of the body and result in a direct developmental effect on hormone levels or behavioral change.
