ScienceIQ.com

The Sound of Turbulence

Do you ever watch the water tornado that forms in a draining bathtub? Woe unto any rubber ducky floating aimlessly in the vicinity; the water's force will pull it down into the tornado. The center of the swirl--the vortex--creates a whirlpool so strong that it's hard for small objects to escape. The same thing happens in the sky with jets. Planes ...

Continue reading...

TheSoundofTurbulence
Biology

What's The Difference Between A Sweet Potato And A Yam?

What's in a name? Although supermarkets offer both 'yams' and 'sweet potatoes,' in fact they are all sweet potatoes. True yams are rarely seen in the United States, and are actually quite different ... Continue reading

SweetPotatoYam
Geology

Wetter not Necessarily Better in Amazon Basin

June through September is the dry season for the Amazon Basin of South America. Yet the basin's dry season may be getting uncharacteristically wetter, according to NASA's Goddard Space Flight Center ... Continue reading

AmazonBasin
Biology

The Dogma of Life

Dogmas are authoritative tenets common in religion and philosophy. But in molecular biology? Molecular biology has a central dogma, proposed by Francis Crick in 1953, that says that genetic ... Continue reading

MolecularBiology
Astronomy

Voyager Phone Home

After historic visits to Jupiter and Saturn, Voyager 1 is now on course to be the first human-made object to leave our solar system. In space for more than 25 years, it has already traveled farther ... Continue reading

Voyager

Coffee: Beverage Of Sedition

CoffeeBeverageOfSeditionCoffee is the most popular drink in the world, consumed regularly by about one-third of the global population. Tea runs a close second. And then, of course, there's Coca-Cola. Why are coffee, tea, and cola so popular? They all contain caffeine, which acts as a stimulant -- just like the closely-related alkaloids cocaine and nicotine. Also like those other chemicals, caffeine raises levels of dopamine, a neurotransmitter that activates the brain's pleasure centers. Caffeine is addictive, too, so once you start drinking it regularly it's hard to quit. Symptoms of caffeine withdrawal include a severe headache that can last for several days.

As a stimulant, caffeine can push the brain and body into heightened alertness, and by raising dopamine levels it can serve as a powerful motivator. That's why employers offer free coffee to their employees. But things have not always been that way. In both Asia and Europe, holders of power have tried to ban coffee houses as places where 'idle and disaffected persons' get together to discuss politics.

A 17th-century traveler quoted in Hugh Johnson's history of wine noted that the Turkish Vizier had tried to ban coffee houses because they were 'melancholy places where Seditions were vented, where reflections were made on all occurrences of State, and discontents published and aggravated.' At around the same time, England's King Charles II issued a proclamation banning coffee houses as places where 'divers false, malicious and scandalous reports are devised and spread abroad to the defamation of his Majesty's Government.' (The English proclamation also banned the selling of chocolate, sherbet, and tea.) Needless to say, the popularity of coffee houses proved far greater, and far more enduring, than that of the King and Vizier.