Okay, let’s break this down. Peng has skills like nanotechnology, materials science, and characterization, which are in demand. He also has experience in research, project management, and team leadership. Location is Baltimore, MD, which is a mid-sized city with a lower cost of living compared to major hubs like NYC or San Francisco. However, salaries for materials scientists in the US can range from $80,000 to over $150,000 depending on experience and industry. Considering Peng’s skills and experience, I’d estimate his hourly rate to be around $125, which is on the lower end of the range but still reflective of his value as a materials scientist.