Hello all, In chemistry class we recently began the subject of nuclear chemistry. I'm sure you all know that nuclear chemistry unleashes a swarm of new particles. My teacher mentioned the Positron, a particle few of my classmates recognized. To help us understand its nature we were told to think of it is a positive electron. Why has it taken a whole year of Chemistry class to learn about the electron's brother? Why don't positrons affect chemical reactions at all? Are they simply less frequently seen than electrons? Furthermore, what IS a positron? I've heard of physicists describing it as an electron going backwards in time... which is completely befuddling. Any insight would be appreciated.