BigQuery provides a limited number of sample tables that you can run queries against. Each sample table is listed here, and you can find more information about each table by visiting the corresponding pages. In the case of the M-Lab sample tables, these are collected in a M-Lab public project that contains monthly M-Lab logs.
|gsod||Samples from US weather stations since 1929||115M|
|mlab||Measurement data of broadband connection performance||240B|
|natality||Birth information for the United States from 1969 to 2008||68M|
|shakespeare||Word index for works of Shakespeare||164K|
|wikipedia||Revision information for Wikipedia articles||314M|