Half of the water flowing through regional river basins starts in so-called ephemeral streams. Last year, the Supreme Court curtailed federal protections for these waterways.
A riparian area in Wells, Nev., in the northeastern part of the state. In the West, ephemeral streams flow only for four to 46 days per year, on average, but contribute up to 79 percent of the downstream river flow, new research has found.
Industry groups said the E.P.A. had exceeded its authority in requiring the drinking-water cleanup. The chemicals, known as PFAS, are linked to cancer and health risks.
Agents from various federal agencies will focus on unauthorized candy-flavored and nicotine-laden vapes that have flooded the U.S. market from overseas.
The panel endorsed targeting a variant of the coronavirus that is now receding, though some officials suggested aiming at newer versions of the virus that have emerged in recent weeks.
Studies have shown that protection against serious illness from Covid-19 tends to improve as the vaccines more precisely target dominant strains, according to the Food and Drug Administration.
An independent group of experts expressed concerns that the data from clinical trials did not outweigh risks for treatment of post-traumatic stress disorder.
A dose of MDMA from the MAPS Public Benefit Corp., which is now renamed as Lykos Therapeutics, a for-profit company whose studies the F.D.A. is analyzing.
Developed in 1912, MDMA was reclassified in 1985 as a Schedule I substance, a drug defined as having no accepted medical use and a high potential for abuse.
The agency’s staff analysis suggests that approval of the illegal drug known as Ecstasy for treatment of PTSD is far from certain, with advisers meeting next week to consider the proposed therapy.
A seizure of the drug MDMA, known as Ecstasy or molly. It and other psychoactive drugs are still classified as illegal drugs with a potential for abuse.
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