Either let them know you are there or check your blind spots
The sclera is the answer for your question
There are conjoined twins which are formed, a single egg develops into 1 baby. Sometimes a single egg divides in half 1 to 2 weeks after it's fertilized. This creates a set of identical twins. The exact cause of conjoined twinning is not known.
There are non identical twins.Non-identical twins form from two completely separate eggs which are fertilised by two completely separate sperm. These fraternal twins are no more alike than any other siblings in a family with the same biological mother and father. Because identical twins share the same genes, they are always the same gender.
Imagine that more than 60% of people are not insured and there is a major catastrophy in a certain area where people are not insured. Due to this, they will have to pay for their own bills and because they have to pay for their own bills, they can lose all their money.
There is a cascade happening here because when a large group of people lose their money, this negatively affects the local economy and can slow the market down.
This is a very complex problem that can negatively affect a very varied group of people and is hard to explain in a simple and short way :)