"The American Association for the Advancement of Science (AAAS) offers paid full-time and part-time 12-week internships throughout the year. AAAS internships are open to undergraduate and graduate students and recent college graduates. As an Intern  you can expect to:

• Collaborate with employees and other interns professionally and socially,
• Apply knowledge attained through your education to real work situations, 
• Learn about AAAS as a whole and understand the organization outside of your assigned department, and
• Benefit from clear expectations and instructions from experienced employees in similar fields."

See current openings on the AAAS website