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What Is the Mohorovicic Discontinuity and Can Humans Ever Reach It?

science.howstuffworks.com/environmental/earth/geophysics/mohorovicic-discontinuity.htm

This seismic boundary lies within Earth between the bottom of crust and the uppermost mantle. But nobody has ever dug down deep enough to confirm it exists. So does it?

Could I see a flashlight beam from Earth on the moon?

science.howstuffworks.com/question441.htm

If I was on the moon and the earth was black (no lights were on) and a flashlight was turned on facing the moon, would I see the light? If I couldn't, would there be any way to detect any residual matter that came from the light on Earth or does light die after a certain distance?

Are We Entering the Sixth Major Extinction on Earth?

science.howstuffworks.com/life/evolution/sixth-major-extinction.htm

A new global report says 1 million species are at risk of extinction - the greatest number in human history.

What if a black hole formed near our solar system?

science.howstuffworks.com/science-vs-myth/what-if/what-if-black-hole-formed-near-solar-system.htm

Black holes have serious pull, and they're not afraid to use it. Could one of these skulking bad boys ever arise in our home, sweet (solar system) home?

Top 10 Hotels That Will Scare the Daylights Out of You

science.howstuffworks.com/science-vs-myth/afterlife/top-5-haunted-hotels.htm

Haunted hotels are found in literature and movies -- we're enthralled with the idea of them. Learn more about haunted hotels and their creepy stories.

Can two cans and a string really be used to talk over a distance?

science.howstuffworks.com/question410.htm

I was watching an old movie today, and two kids (neighbors) were talking to each other using two tin cans and a string. Does that really work? If so, why does it work?

The Four Planets With Rings Might Surprise You

science.howstuffworks.com/planets-with-rings.htm

Move over Saturn. There are other planets in the solar system surrounded by ring systems.

Eugenics Overshadows the Legacy of Scientific Genius Francis Galton

science.howstuffworks.com/innovation/big-thinkers/francis-galton.htm

Francis Galton did pioneering work in meteorology, psychology, statistics and biometrics. But today he is mainly remembered for promoting eugenics.

How Lunar Landings Work

science.howstuffworks.com/lunar-landing.htm

People around the world watched as Neil Armstrong touched the moon and declared, "That's one small step for man; one giant leap for mankind." But how did we put a man on the moon?

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