# Microbes were discovered by a merchant, not a scientist Anton van Leeuwenhoek was the first person ever to see unicellular animals, bacteria, red blood cells and sperm, but he was a merchant and didn't go through university studies. He designed and crafted his own lenses. He kept how they were made a secret all his life. ## Road signs - [[The discovery of virus didn't involve seeing it]] --- Sources: [Wikipedia](https://en.wikipedia.org/wiki/Antonie_van_Leeuwenhoek)