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What's the Difference Between Twilight and Dusk?
science.howstuffworks.com/nature/climate-weather/atmospheric/twilight-dusk.htm
Dusk is a beautiful time of day. So is twilight. But when does one turn into the other? And did you know there were three versions of each?
What's the Difference Between a Blood Moon and a Lunar Eclipse?
science.howstuffworks.com/blood-moon.htm
Blood moons always bring out the stargazers though they aren't that rare. So what makes blood moons red? And do they differ from lunar eclipses?
What's the Difference Between a Castle and a Palace?
science.howstuffworks.com/engineering/architecture/castle-palace-difference.htm
Castles and palaces may seem the same, in their grandiose architecture and palatial structure. But the two buildings were constructed by monarchs for different purposes.
What's the Difference Between a Cave and a Cavern?
science.howstuffworks.com/environmental/earth/geology/cave-cavern-difference.htm
One term might give you the impression of something grand and mysterious, while the other makes you think of claustrophobia-inducing environs that threaten human life. But what's the real difference?
What's the Difference Between a Lake and a Pond?
science.howstuffworks.com/environmental/earth/geophysics/lake-pond-difference.htm
It's not just the size that differentiates a lake from a pond. The real distinctions flow much deeper.
What's the Difference Between a Nautical Mile and a Mile?
science.howstuffworks.com/innovation/science-questions/question79.htm
What is a nautical mile, and how does it differ from a normal mile and a kilometer?
What's the Difference Between a Windmill and a Wind Turbine?
science.howstuffworks.com/windmill-vs-wind-turbine.htm
Windmills and wind turbines work on the same core principle to convert wind into energy, but one creates mechanical energy while the other creates electricity. Here's how they work.
What's the Difference Between an Avenue, a Road and a Boulevard?
science.howstuffworks.com/engineering/civil/difference-between-avenue-road-boulevard.htm
The name bestowed on a road depends on its size and function. And it's not just up to your neighborhood's developer either.
What's the Earth's biggest threat to biodiversity?
science.howstuffworks.com/environmental/conservation/issues/biggest-threat-to-biodiversity.htm
The biggest threat to biodiversity on Earth is explained in this article from HowStuffWorks. Learn about the biggest threat to biodiversity.
What's the Fascination With Number 23?
science.howstuffworks.com/science-vs-myth/everyday-myths/whats-fascination-with-number-23.htm
From plane crashes and deaths to sports superstitions and hexagrams, many people believe that the number 23 possesses magical properties.