Touring the pyramids and sailing down the Nile are undoubted highlights of any trip to Egypt — but what else should be on your list?

For decades, scientists have been tinkering with ways to force clouds to make it rain—or snow. One company says it’s approaching a breakthrough.

The researchers interpret that pattern as reduced sensitivity to stronger fullness signals under stress. Still, the finding is preliminary, Kipping emphasizes. But it could suggest that stress may ...