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How Customs Works

science.howstuffworks.com/transport/flight/modern/customs.htm

To most people a trip through customs is just another stop in an airport or a country's borders. But customs agencies do much more for their countries' governments. In fact U.S. Customs raises more revenue than any agency except the IRS. Find out why and how they do it.

How DNA Evidence Works

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DNA evidence is explained in this article from HowStuffWorks. Learn about DNA evidence.

How DNA Profiling Works

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How DNA profiling works involves creating a DNA profile. Learn how DNA profiling works and how a DNA profile works.

How DNA Works

science.howstuffworks.com/life/cellular-microscopic/dna.htm

DNA contains genetic material that gets passed down to each successive generation. Learn about DNA and find out what information each strand of DNA contains.

How Dangerous Was the Ohio Chemical Train Derailment?

science.howstuffworks.com/environmental/green-science/ohio-train-derailment-news.htm

The disastrous Feb. 3 train derailment contaminated East Palestine, Ohio. We talked to an expert about the potential environmental and health impacts to come.

How Dark Matter Works

science.howstuffworks.com/dictionary/astronomy-terms/dark-matter.htm

For decades, stargazing scientists have been facing their own darkness on the edge of town as they try to explain one of astronomy's greatest mysteries: dark matter. Have they been successful, or will the universe carry its secrets for a long time?

How Death Masks Work

science.howstuffworks.com/science-vs-myth/afterlife/death-mask.htm

The best photograph can't touch one. A death mask, in all its 3-D glory, is the last likeness of a loved one that a family can own. After all, it vividly preserves what some consider to be the very essence of a person -- the face.

How Deep Are the Great Lakes? And Why Are They Great?

science.howstuffworks.com/environmental/earth/geophysics/5-reasons-why-great-lakes-are-so-great.htm

The Great Lakes are named so for several reasons. HowStuffWorks looks at why the Great Lakes are so great, including their impressive depths.

How Deep Brain Stimulation Works

science.howstuffworks.com/life/inside-the-mind/human-brain/deep-brain-stimulation.htm

Deep brain stimulation delivers short pulses of electricity directly to your brain. Find out how deep brain stimulation works.

How Deep Impact Works

science.howstuffworks.com/dictionary/astronomy-terms/deep-impact.htm

How do scientists find details about the early days of our solar system? One way is to investigate comets. Find out how the Deep Impact spacecraft fired an impactor into Comet Tempel 1 to get some answers.

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