What Causes Headaches?

In ancient Greece, the best-known remedy for a long-standing headache was to drill a small hole in the skull to drain supposedly infected blood. Fortunately, doctors today don’t resort to power tools to cure headaches, but we still have a lot to learn about this ancient ailment. In this Ted Ed lesson Dan Kwartler shares what we know (and don’t know) about headaches.

Today, we’ve classified headaches into two camps— primary headaches and secondary headaches. …we actually know much more about secondary headaches. These are caused by other health problems, with triggers ranging from dehydration and caffeine withdrawal…the origins of primary headaches remain unknown. Scientists are still investigating potential triggers for the three types of primary headaches: recurring, long-lasting migraines; intensely painful, rapid-fire cluster headaches; and, most common of all, the tension headache.

 

 

How The Human Digestive System Works

Constantly churning inside of you, the digestive system performs a daily marvel: it transforms your food into the vital nutrients that sustain your body and ensure your survival. Emma Bryce traces food’s nine-meter-long, 40-hour journey through the remarkable digestive tract.

Across the planet, humans eat on average between 1 and 2.7 kilograms of food a day, and every last scrap makes its way through the digestive system. Comprised of ten organs covering nine meters, this is one of the most complicated systems in the body.

 

 

The Dark Coin Riddle

Can You Solve The Dark Coin Riddle?

You heard the travelers’ tales, you followed the maps, and now, you’ve finally located the dungeon containing a stash of ancient coins. The good news: the wizard who owns the castle has generously agreed to let you have the coins. The bad news: he’s not quite as generous about letting you leave the dungeon … unless you solve his puzzle. Can you solve it and get out alive? Lisa Winer and TED-Ed show you how.

 

 

How Aspirin Was Discovered

4000 years ago, the ancient Sumerians made a surprising discovery: if they scraped the bark off a particular kind of tree and ate it, their pain disappeared. Little did they know that what they’d found was destined to influence the future course of medicine. Krishna Sudhir, of TED-Ed, traces the history of aspirin.

 

 

 

 

 

How Small Are We In The Scale Of The Universe?

Let’s Begin…

 
In 1995, scientists pointed the Hubble Telescope at an area of the sky near the Big Dipper. The location was apparently empty, and the whole endeavor was risky – what, if anything, was going to show up? But what came back was nothing short of spectacular: an image of over 1,500 galaxies glimmering in a tiny sliver of the universe. Alex Hofeldt helps us understand the scale of this image.

 
 

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