At the uppermost reaches of stream networks, headwaters dry up during the summer, then burst back into existence when spring brings rain. These nonperennial headwater streams are individually small, ...

For the small tanks and line sizes required by specialized processes, the ST75 Flow Meter is an accurate, no moving parts, ...

While some states have passed or are considering legislation to allow nitrogen gas executions, it is uncertain how widely the method will be used. Public support for the death penalty is declining ...

Louisiana is scheduled to use nitrogen gas in an execution for the first time tonight. Here's what to know ahead of the expected execution of Jessie Hoffman, Jr., age 46. Louisiana state law ...

On Tuesday the state did just that, carrying out its first execution since 2010. It used nitrogen gas, a method that was first used by Alabama last year and that was legalized by Louisiana ...

Arkansas became the fifth state to authorize nitrogen hypoxia as a method of execution Tuesday, after Republican Gov. Sarah Huckabee Sanders signed legislation codifying the controversial method ...

A Louisiana death row inmate on Tuesday was executed with nitrogen gas, a method that has never been used before in the state. "Louisiana has successfully used nitrogen hypoxia to carry out the ...

March 19 (UPI) --Louisiana has carried out its first nitrogen hypoxia execution and its first execution in 15 years, killing Jessie Hoffman Jr. on Tuesday night for the 1996 kidnapping ...

Nitrogen gas had only been used in death row executions four times before Tuesday, all in Alabama. Last year, the method was used to execute Carey Dale Grayson for the killing of Vickie DeBlieux ...