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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.

The Great Planetary Conjunction of 2020

science.howstuffworks.com/great-conjunction.htm

In 2020, Jupiter and Saturn aligned so closely that, from Earth, they looked like they were practically touching. The last time we saw this was in 1226.

PEMDAS: Remembering Math's Order of Operations

science.howstuffworks.com/math-concepts/PEMDAS.htm

A simple math problem may seem to some of us like an inscrutable pile of numbers and symbols, just waiting to trip us up. PEMDAS to the rescue!

Alkali Metals: Elements in the First Column of the Periodic Table

science.howstuffworks.com/alkali-metals.htm

Although the term might be unfamiliar, you know all about alkali metals. Ever used salt or eaten a banana? So, what special properties do these elements have?

From Military to Mainstream: The Evolution of the AR-15

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The ArmaLite AR-15 rifle has become a hot-button issue in the American landscape. Where did the rifle originate and how did it become so controversial?

What if China never had a one-child policy?

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China's government imposed mandatory IUDs and mass sterilizations, among other measures. That's some serious micromanagement. Was it necessary to avert a population disaster?

What if sea levels rose 12 inches?

science.howstuffworks.com/science-vs-myth/what-if/what-if-sea-levels-rose-12-inches.htm

Figuring out how to deal with rising sea levels isn't some kind of purely academic exercise. It's happening. So how do we deal with it, especially if the sea rises a foot in our lifetime?

Did Humans Evolve From Monkeys? Human Evolution Explained

science.howstuffworks.com/life/evolution/humans-descended-from-apes.htm

Since Charles Darwin published the theory of evolution by means of natural selection, myths and misinterpretations have eroded public understanding of his ideas. Ready to take another look at one of the related questions that just won't die?

Reflexology: Bogus, Beneficial or a Bit of Both?

health.howstuffworks.com/wellness/spa-health/reflexology.htm

The ancient art of reflexology focuses on pressure points exclusively on hands and feet. HowStuffWorks looks at whether it really relieves stress.

Jackals: Canine Survivors and Tricksters of Folklore

animals.howstuffworks.com/mammals/jackals.htm

Jackals are adaptable and wily, survivalists to the core. HowStuffWorks looks at these formidable canines.

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