I had my dogs wear and walk with 12 different collars to find the very best. Here are the four perfect for any dog.

Current approaches to silver recovery from end-of-life PV modules are dominated by acid leaching. While effective, the ...

Dynamic loading due to pulsation is a critical consideration in piping systems connected to reciprocating machinery, such as ...

National security, unlocked. Each Thursday, host Mary Louise Kelly and a team of NPR correspondents discuss the biggest national security news of the week. With decades of reporting from battlefields ...