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5 Things You Didn't Know About the Autumnal Equinox
The autumnal equinox is the day Earth is perfectly angled to the sun, so the day and night are of equal length. Well, almost.
What Countries Use the Imperial System?
science.howstuffworks.com/why-us-not-on-metric-system.htm
Most of the world uses the metric system for everyday measurements, but only three countries in the world use the imperial system as their official system of measurement.
How Optical Illusions Work
science.howstuffworks.com/optical-illusions.htm
It's a young lady! It's an old woman! It's a blue dress! No, it's gold! Why are we fooled by optical illusions and what do they tell us about how the brain works?
Could you dig a hole all the way to the Earth's mantle?
science.howstuffworks.com/environmental/earth/geophysics/dig-hole-to-earths-mantle.htm
Have you ever read "Journey to the Center of the Earth" and wondered if it were possible to do it? Well, scientists are in the process of giving it their best shot. How hard is it to dig a hole this deep, and what might they find?
5 Ideas for Experiments on Conserving Energy
science.howstuffworks.com/environmental/conservation/5-experiments-conserving-energy.htm
About 70 percent of our energy comes from non-renewable sources like oil and natural gas. When they're gone, they're gone for good. Learn some simple ways to conserve energy through these five simple experiments.
What Is the Point of Daylight Saving Time?
science.howstuffworks.com/innovation/everyday-innovations/daylight-saving-time.htm
We humans aren't complete slaves to time. We've devised ways to pack an extra hour of sunshine into our day, thanks to daylight saving time. But who came up with this idea and why do so many people loathe it?
How Seed Banks Work
science.howstuffworks.com/environmental/green-science/seed-bank.htm
Seed banks store our world's seeds, in case disaster wipes out a plant species. Find out how seed banks protect our future.
How Urban Sprawl Works
science.howstuffworks.com/environmental/green-science/urban-sprawl.htm
Urban sprawl occurs when people move from cities to the areas around them and develop the land with houses, businesses and roads. Learn about urban sprawl.
How No-fly Zones Work
science.howstuffworks.com/no-fly-zone.htm
No-fly zones are employed by NATO and the United Nations to protect civilian populations. Learn about the enforcement and effectiveness of no-fly zones.
How Kaleidoscopes Work
science.howstuffworks.com/kaleidoscope.htm
Kaleidoscopes have been fascinating people since the early 19th century. Whether you think of kaleidoscopes as toys or as works of art, no matter how often you look inside, you'll never see the same thing twice.