Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_13301516_1 ( no_in_series VARCHAR, original_air_date VARCHAR )

### Question ###
How many episodes originally aired on April 29, 2008?

### Accurate SQL ###

SELECT COUNT(no_in_series) FROM table_13301516_1 WHERE original_air_date = "April 29, 2008"