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Rhodium: Earth's Rarest and Most Expensive Precious Metal
science.howstuffworks.com/rhodium.htm
Discovered in the early 1800s from a chunk of smuggled platinum ore, rhodium is the most valuable precious metal on the planet today, used mainly for keeping car emissions in check.
Rhodonite: A Mineral of Love, Roses and Eagles
science.howstuffworks.com/environmental/earth/rhodonite.htm
The rose-red mineral rhodonite was first discovered in the 1790s in the Ural Mountains of Russia. Today it's found globally and is associated with compassion, love and healing.
Richard Sharpe Shaver, UFO Hoaxster
science.howstuffworks.com/space/aliens-ufos/richard-sharpe-shaver.htm
Richard Sharpe Shaver was a controversial UFO storyteller promoted by Ray Palmer. Check out his amazing stories of aliens called deros and teros.
Ridiculous History: 5 of NASA's Greatest Pranks
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NASA likes to have a lot of fun, too. Find out what ridiculous pranks they've pulled through the years at HowStuffWorks.
Rising Rock: Earth's Crust Has Its Own Tides, Too
science.howstuffworks.com/environmental/earth/geology/rising-rock-earths-crust-has-its-own-tides.htm
The oceans on planet Earth cycle through daily tidal changes. But the ground beneath our feet experiences tides of its own, too.
River-bottom Bones: The Strange World of Underwater Fossil Hunting
science.howstuffworks.com/environmental/earth/geology/underwater-fossil-hunting.htm
Not all fossils are found on dry land. In fact some of the most fascinating fossil finds in history have been submerged for centuries.
Robin the Robot Helps Sick Children Feel Less Lonely
science.howstuffworks.com/robin-the-robot.htm
A hospital stay can be a stressful experience for anybody, and especially for a child. But a smiling new robot named Robin plays games, tells stories and comforts children in need of a friend.
Roman Ruins Discovered Underwater in Tunisia
Archaeologists discovered what they believe to be ruins of the Roman city of Neapolis - underwater near Tunisia.
Ronald Reagan Sees a UFO
science.howstuffworks.com/space/aliens-ufos/ronald-reagan-ufo.htm
The Ronald Reagan UFO sighting occurred in 1974 while Reagan was flying to Bakersfield, California. Reagan told a reporter afterwards, but hasn't discussed the event since. Learn more about the Ronald Reagan UFO sighting.
Rossby Waves Affect Our Weather and Tides, But What Are They?
science.howstuffworks.com/environmental/earth/geophysics/rossby-waves.htm
Rossby waves influence everything from high tides to extreme weather patterns, and not just on Earth. They also occur on the sun and on Venus and Jupiter as well. So, what are they exactly?