Hi there!
So, sometimes scientists want to learn about things that affect humans. But they can't just do experiments on people because it's not safe or ethical to do so. Instead, they use animals as a model to help them understand how things work in humans.
Non-human primates are animals that are similar to humans in many ways, like how their brains and bodies are structured. So sometimes scientists use them in experiments to learn more about things that affect humans, like new medicines.
However, these experiments are very carefully regulated and controlled to make sure that the animals are treated with respect and care. The animals are given proper food, water, and housing, and they are monitored closely to make sure they are healthy and not in pain.
Before any experiments are done, scientists have to get approval from a group of people called an ethics committee. The committee looks at the experiment plan and decides if it's ethical to do the experiment or not. They make sure that the animals are being used for a good reason and that the experiment won't cause unnecessary harm to the animals.
So, in summary, scientists use non-human primates in experiments to learn more about things that affect humans. They take very good care of the animals and make sure the experiments are ethical and safe.