Is There a Reflection Symmetry in a String Theory?

There are two kinds of particles, left handed and right handedan we havein chemistry. And so it's a similar idea that that nature selects a doesn't appear in a reflection symmetric way. What's different is that the weak interactions that we talked about in previous sessions only couples to the left handed electron and the right handed electron. So this was the problem. A, and what was observed in 19 84 by green and schwartz was, a, that there’s a sensitive issue, a, when you have this kind of handidness of interactions,. The theory can be inconsistent quanta mechanically. At that time, the greenschwartz anomaly cancellation conditions were used