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Grades 9-12

Article

The Effects of DEET on Bioluminescent Dinoflagellates, Pyrocystis fusiformis

Puerto Rico is home to three bioluminescent bays, protected inlets that hold millions of marine bioluminescent dinoflagellates. These bays are huge tourist attractions, and swimming in them, when permitted, is popular. Often the visitors have sprayed themselves with insect repellants containing the active ingredient DEET. The purpose of this paper is to examine the effects of DEET on the ability of the dinoflagellates to emit light.

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Article

Helpful Hints for Field Sketching

People often assume that drawing skills are something you're born with. But the truth is, like any other skill, drawing is something you can learn. Start sketching with these helpful hints.

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Article

The Movement of Ice Sheets

More than any other, the West Antarctic Ice Sheet has the greatest potential to raise sea levels all over the world. Learn how scientists are studying it, both in the field and back in the lab.

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Activity

How to Press and Preserve Plants

Autumn leaves, flawless fronds, prickly grasses, and perfect petals—all are great specimens to be noted and preserved. Find out how to press like a pro.

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Article

Tips to Identify Poison Ivy

Did you know that the first time you come in contact with poison ivy, you probably won't get a rash? Every time after that, though, is a different story. Learn how to spot different varieties.

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Diagram

Leaf Arrangement

Leaves are attached to stem nodes in three different arrangements: alternate, opposite, and whorled. Learn how to spot these leaf arrangements before venturing out on your next field study. 

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Diagram

Leaf Type

Compound or single? Knowing this fundamental difference in leaf type is key to identifying plant specimens. This illustrated guide shows you what both look like. 

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