Watch Clip
Household Poison From the Past
56s
A brief history of dangerous chemicals and compounds in our homes.
American Experience, TV's most-watched history series, brings to life the compelling stories from our past that inform our understanding of the world today.
Video description: On December 6, 1935, the first bucket of concrete was poured onto the dam site. To prevent the possibility of cracking, concrete was poured into hundreds of 50 foot square blocks every 72 hours. After each pour, workers would scrub the concrete with wide brushes to remove scum. Millions of cubic yards were poured, and in February 1938, the foundation was completed 14 months ahead of schedule.
Check out the new streaming service from Cascade PBS, which pairs your PBS favorites with an ever-growing selection of TV series and films from around the world. Enjoy dedicated mobile and TV apps.