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Introduction to Constellations

'Constellation' is the name we give to seeming patterns of starsin the night sky. 'Stella' is the Latin word for star and a constellation is a grouping of stars. In general, the stars in these groups are not actually close to each other in space, they just appear to be close when viewed from Earth. If we could travel by spaceship to another part of ...

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IntroductiontoConstellations
Physics

When Do We Encounter Ionizing Radiation In Our Daily Lives?

Everyone who lives on this planet is constantly exposed to naturally occurring ionizing radiation (background radiation). This has been true since the dawn of time. The average effective dose ... Continue reading

IonizingRadiation
Chemistry

Ozone: Good Up High, Bad Nearby

Ozone is a gas that forms in the atmosphere when 3 atoms of oxygen are combined (03). It is not emitted directly into the air, but at ground level is created by a chemical reaction between oxides of ... Continue reading

Ozone
Biology

Phrenology

Does a bumpy head mean you're a brainy guy? In the 19th century, many people were absolutely convinced that bumps were the keys to understanding the human brain after Austrian medical student, Franz ... Continue reading

Phrenology
Medicine

It's Hay Fever Season!

If spring's flying pollen is making you sneeze, you are not alone. Some 40 to 50 million people in the United States complain of respiratory allergies, and experts estimate that three to four million ... Continue reading

HayFever

Lunar Explorations

LunarExplorationsEver since the beginning of intelligent life on Earth, the moon has been a focal point of human curiosity. Galileo’s discovery in 1610 that the moon had craters, valleys and mountains, instead of the smooth surface previously believed, only added to a burning desire to learn more.

So when exactly did our up-close-and-personal explorations begin? It was in 1959 that the Russians started sending their Luna probes to the moon. The first man-made object to land (actually, crash) on the moon was Luna-2. That same year Luna-3 sent the first images of the far side of the moon – the side hidden from the Earth for more than 4.5 billion years. The USA caught up with the Russians in 1969 when the first manned mission, Apollo 11, landed on July 20. 'That's one small step for man, one giant leap for mankind,' Neil Armstrong proclaimed as he stepped onto the lunar surface. (He was supposed to say 'one small step for a man,' but he misspoke under the pressure of that historical moment.) Since that day, five more manned Apollo missions have landed on the moon. The last one, Apollo 17, left the moon on December 14, 1972, and no humans have returned since. All together only ten humans, none of them women, have walked on the surface of the moon.