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Knee Replacement Overview

health.howstuffworks.com/medicine/surgeries-procedures/knee-replacement.htm

Getting a knee replacement is often a last resort for those whose knees are destroyed by arthritis or wear and tear. Learn about knee replacements.

How Trains Work

science.howstuffworks.com/transport/engines-equipment/train.htm

We humans are mobile. Long before flight, FusionMan or even your average automobile arrived on the scene, trains were transporting us all over civilization. How did we get from horse-drawn carts to high-speed trains?

How the MQ-9 Reaper Works

science.howstuffworks.com/reaper.htm

Early unmanned aerial vehicles (UAVs) primarily carried out reconnaissance missions in war zones, but the Reaper packs some serious heat. Is there anything more foreboding than a drone with a Hellfire missile?

How That Creamy Chocolate Is Made

science.howstuffworks.com/innovation/edible-innovations/chocolate.htm

Chocolate comes from the equatorial cacao tree's unassuming cocoa beans. Learn the steps from tree to table as cocoa beans become sumptuous chocolate.

A Guide to Botanicals for Seniors

health.howstuffworks.com/wellness/food-nutrition/vitamin-supplements/botanicals-seniors.htm

Botanicals have been receiving a lot of press lately, but they can be dangerous. Learn about the safety of botanicals for seniors.

Benefits of Walking

health.howstuffworks.com/wellness/diet-fitness/exercise/benefits-of-walking.htm

The benefits of walking include a reduced risk of disease, improved sleep, less stress, increased energy, and more. Learn more about these benefits.

How PayPal Works

money.howstuffworks.com/paypal.htm

PayPal is the most popular online payment service in use today. Learn how PayPal works, how to use PayPal and about problems with PayPal.

In Honor of Martin Luther King Jr.

people.howstuffworks.com/culture-traditions/holidays-other/mlk-jr.htm

The national American holiday honoring Dr. Martin Luther King, Jr. falls on the third Monday in January. Learn about the life and work of this legendary civil rights activist.

How Plague Works

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

You may be familiar with the medieval "Black Plague," but did you know that bouts of plague still break out today? Find out what causes an outbreak, why plague still exists and how the plague has influenced history.

Creature Effects Makeup: An Interview with Matt Rose and Chad Waters

entertainment.howstuffworks.com/creature-effects.htm

Monsters, monkeys, and freaks oh my! Step behind the scenes and onto the backlots of Hollywood with two of the movie industry's most prolific and talented creature effects artists, Matt Rose and Chad Waters. In this exclusive interview with Matt and Chad, HowStuffWorks learns their opinion on the future of special effects makeup as well as some creature effects movie tricks.

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