Entire or toothed? Being able to distinguish between these two types of leaf margins will help you identify a plant specimen. This illustrated guide shows you what both look like.

At a loss for words when it comes to explaining your biodiversity findings in the classroom, field, or lab? Increase your vocabulary—and observation skills—with this guide to gathering clues.

Don't just take a close look at that arthropod, pick up a pencil and draw it! You'll be surprised how much better you'll understand and appreciate what you're seeing.

What do chocolate and cacao beans have to do with coral reefs? Everything when it comes to biodiversity and the threat of extinction, according to these Kids in the Hall.

See how a day of collecting rocks on the north shore of Long Island turned into an exploration of the Earth's history for this eighth-grader from New York.

The meandering stream that carved West Virginia's natural land bridge also helped create diverse layers of rock at its foundation. Tour the area's geological past with this ninth-grader.