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Chronometer
science.howstuffworks.com/dictionary/astronomy-terms/chronometer-info.htm
A chronometer is a timepiece that is exceptionally accurate. Traditionally, the term refers to the marine chronometer. Learn more at HowStuffWorks.
Cinnabar: Red, Beautiful — and Toxic
science.howstuffworks.com/environmental/earth/geology/cinnabar.htm
Cinnabar's bright-red pigment has been used in jewelry, pottery and makeup for millennia. But cinnabar is also the primary ore for mercury, making it a dangerous mineral if the particles are inhaled.
Classic Airplanes
science.howstuffworks.com/transport/flight/classic/classic-airplanes.htm
Every one of these classic airplanes was the product of loving care of an intelligent design team doing the best work of their era. Learn how aviation evolved and find links to classic airplane profiles, from the early years through today's jet age.
Climate Activist Greta Thunberg Wants More Results, Less Politics
science.howstuffworks.com/environmental/conservation/issues/greta-thunberg-news.htm
In the lead-up to U.N. Climate Change Conference, the Swedish activist talked about Biden's climate plan, the media's responsibility and what gives her hope.
Climate Change Threatens the Moai of Easter Island
The statues of Easter Island have stood for over 800 years. See how climate change and rising seas are affecting them with HowStuffWorks.
Coast Guard Rescue Swimmers Risk All to Save Lives
science.howstuffworks.com/rescue-swimmers.htm
U.S. Coast Guard rescue swimmers routinely jump out of helicopters into dangerous waters, risking their lives to save others.
Cobalt: Essential for Batteries and Bright Blues
science.howstuffworks.com/environmental/earth/geology/cobalt.htm
Cobalt is associated with the color blue, but it's so needed for rechargeable batteries that the U.S. put it on the list of minerals it can't live without.
Colombia, Not Finland, May Be the Happiest Country in the World
The Scandinavian countries tend to come out on top in the World Happiness Report. But the report doesn't actually ask participants if they're happy. When that question is included, the country rankings are quite different.
Color Wheel Theory: How to Talk About Color
science.howstuffworks.com/color-wheel-theory-how-to-talk-about-color.htm
Modern color theory got its start with, believe it or not, Sir Isaac Newton, who also discovered a little thing called gravity and invented calculus.
Commensalism: I Benefit, You Don't, but It's All Good
science.howstuffworks.com/life/biology-fields/commensalism.htm
Commensalism is a form of cooperation among species in which one species benefits from another without the first one suffering any harm from the relationship.