"The sulfur was deposited around the K-Pg boundary ... and the total amount of sulfur released was calculated through mass balance." The scientists revealed that a total of 67 ± 39 billion ...

In the soil, sulfur moves toward the roots by diffusion and mass flow. In diffusion, sulfur moves from a more concentrated area to a less concentrated area—like food coloring dispersing in water.

Chemists in Arts & Sciences at Washington University in St. Louis have received a $1 million contract from the Defense Threat ...