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How the Environment Has Changed Since the First Earth Day 51 Years Ago

science.howstuffworks.com/environmental/conservation/issues/environment-changed-since-first-earth-day.htm

It's been 51 years since the first Earth Day, and while progress has been made in some areas, humanity still has had a major impact on the planet.

A Macaw Will Mate for Life and Swear Like a Sailor

animals.howstuffworks.com/birds/macaw.htm

Macaws mate for life, can speak human words and have even been known to blush when delighted.

Why We Need Artificial Gravity for Long Space Missions

science.howstuffworks.com/artificial-gravity.htm

NASA and other agencies have been studying artificial gravity in hopes they will someday use it to help astronauts combat the effects of weightlessness in space. How close are we to that reality?

Fashion Tips for Women in Their 40s

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These fashion tips for women in their 40s help you stay looking great while reflecting maturity. Take a look at fashion tips for women in their 40s.

Where Was Babylon and Does It Still Exist?

history.howstuffworks.com/history-vs-myth/babylon.htm

The ancient city of Babylon was a byword for wickedness in the Bible. But what is the real story? And how did Saddam Hussein try to bring it back?

Use the 'Sterile Technique' to Safely Unpack Your Groceries

recipes.howstuffworks.com/tools-and-techniques/safely-unpack-groceries.htm

A Michigan physician's video about using a sterile surgical technique to unpack groceries at home went viral. We talked to him and have his advice.

13 Countries With Green-White-Red Flags

people.howstuffworks.com/culture-traditions/national-traditions/countries-with-green-white-red-flags.htm

A nation doesn't design its flag all willy-nilly. These countries with green, white, and/or red flags picked those colors for specific reasons.

A Bicycle Built of Bamboo Is the Ultimate Eco-friendly Ride

science.howstuffworks.com/bamboo-bicycles.htm

Building bicycles with environmentally friendly bamboo is an idea whose time has come. We talk to a master bamboo bike builder about the ins and outs.

What's the World's Tallest Building?

science.howstuffworks.com/engineering/structural/tallest-building-in-the-world.htm

In the last few decades, there's been a sort of arms race to build ever-taller skyscrapers. Which seven currently rank as the world's tallest buildings?

14 Hardest College Majors With the Highest Attrition Rates

people.howstuffworks.com/hardest-college-majors.htm

Some college majors are years of all-nighters in disguise. The hardest college majors often demand a cocktail of grit, gray matter, and an unshakable love for complexity. Whether you're wrangling multivariable calculus or spending entire weekends on lab reports, these fields are not for the faint of heart.

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