2,3,7,8-Tetrachlorodibenzodioxin

The problem was the 2,4,5-T, which was 50% of Agent Orange and was present in a number of those herbicides, had a contaminant in it called dioxin.

TCDD, it's a long name, but it's dioxin, which is the most poisonous chemical there is.

All other chemicals are measured as fractions of the toxic equivalent of TCDD.

And that stuff is extremely durable in the environment.

It lasts for 100,000 years or more, unless it's exposed to very high heat, 300 centigrade or more, or direct exposure to sunlight over a period of time.

The enormous scale of the spray.

the contamination of Agent Orange with TCDD dioxin, and how a battlefield herbicide became a health and benefits issue that followed Vietnam veterans home.

And today we're going to take the next step because eventually history becomes personal.

And that is critical.