A good data scientist is someone who can operate with uncertainty and solve problems using any necessary tools. While it is impossible to be an expert in all aspects of data science, a good data scientist has knowledge of various tools like data analytics, computer science, software engineering, and statistics. Domain knowledge is also important. The data science industry is dominated by analytics, software, consulting and financial services companies, though aerospace/defense only makes up about 0.6% of hiring. Data science jobs are most highly concentrated in California, New York, Washington DC and other major tech hubs, and salaries average around $113k nationally.