user: Question: What was the original are date of series number 71?
Columns: ['No. in series', 'No. in season', 'Title', 'Country', 'Project', 'Status at production', 'Original air date']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: [70.0, 1.0, '"Rebuilding New York City\'s Subway"', 'United States', 'New York City subway expansion', 'Under construction', 'April8,2011']
SQL:

assistant: SELECT "Original air date" FROM "Table" WHERE "No. in series" = 71.0;