Cities across the country are sinking, especially in Houston and other cities in Texas, posing significant threats from flooding and damage to infrastructure.

A more active severe weather pattern is ahead beginning later this week in the Plains and Midwest that could produce large hail, wind damage and possibly a tornado threat.

The storm system that has been soaking the South for days is now on the move. That means localized flash flooding is possible in the mid-Atlantic Tuesday.

Scientists have discovered that as many as 83% of bird populations are declining in the very places where they should be thriving. Loss of habitat due to climate change is the primary cause of the decline. However, in some areas, researchers are seeing an increase in population as well. Watch this video to see where the numbers are shrinking the most in the U.S.

Ever looked up and spotted a glowing ring around the sun, or what seemed like a second sun hanging in the sky? From shimmering halos and sun dogs to ghostly Brocken specters and wave-like Helmholtz clouds, we’re breaking down the science behind these jaw-dropping sky illusions - nature’s own surreal art show.