A fen may appear to be just another wet area, until you walk on it.

Glacial erratics are a remnant from the most recent times when glaciers covered much of the surface of Iowa.

Carter Lake, Iowa, is unique because it is in Nebraska.

Black squirrels are common in Council Bluffs, but not many other locations in Iowa.

As a branch heated up in the campfire, a liquid started dripping out of the bark. 

There are efforts to reclaim the land used for a coal mine in Logan, Iowa. 

When you drive by a wind farm, you may see many wind turbines spinning. It is also common to see a few wind turbines not spinning.

When spearfishing, objects appear to bend when inserted into the water.

Iowa flowers have many different shapes and colors.

"No-till" is an agricultural land management practice.

On a snowy day, snow has melted on sidewalks and streets but remained on grassy areas.

Marine fossils can be found in Iowa.

Two neighboring fields are shown. One is flooded while the other is not.

Reducing drag and gas usage of semitrailers is an important engineering design problem.

Maple sap can be collected from certain trees.

A pony truss bridge is different from other truss bridges because it allows traffic to go through it, but is not connected by braces over the top.

This program in Eastern Iowa supports extending solar power use in the area.

Several beds of crinoids have been found in Coldwater Cave in Winneshiek County.