Excavations of an ancient construction site in Pompeii have revealed the process of how Romans mixed their self-healing concrete.

Readers clash over Trump, Biden, inflation, media bias and the ACA in this week’s Speak Out, from fact-checking economic claims to fiery takes on pardons, racism and political power.

Renewable energy use in the U.S. has doubled in the past decade, with state-level contributions varying. Some states produce over half their electricity from renewables, targeting 100% clean energy ...