Neighborhoods in Sierra Madre face a weekend of cleanup after the most powerful storm of the season left parts of the ...

In 2015, scientists announced they had a solution. RSL were likely the result of liquid water flowing downhill on Mars. Later reports speculated that RSL may even be a good place for life.

When hills are healthy, vegetation anchors soil in place. But when that vegetation is burned off, hillsides become vulnerable to erosion, and slopes can come crashing down.

They always flow downhill because of gravity ... My kayak is being pushed along by the water as it gradually flows downhill. The water looks quite flat here, but in other places it can be much ...