Andean condors are seriously fuel efficient -- they only flap their wings for one percent of their total time in the air! Learn more about these amazing birds in today's episode of BrainStuff.

These two alcohols can both be used to make hand sanitizer, but only ethyl alcohol is drinkable. Learn how ethanol and isopropanol differ in this episode of BrainStuff.

Frederick Douglass's skills as a writer an orator made him a face of the abolitionist movement and went on to help inform and inspire the Civil Rights movement. Learn more about Douglass in this episode of BrainStuff.

As casual computer use shifts to touchscreens, the wear patterns on computer keyboards have evolved.

Scents affect how we experience different cultures and places, which means they have historical value. Learn how researchers are setting about preserving them in this classic episode of BrainStuff.

This genus of plant-eating dinosaurs had awesomely heavy armor, might've had a great sense of smell, and some had a serious defensive weapon in their tail. Learn more about ankylosaurs in this episode of BrainStuff.

Prior to flight becoming common, 'SOS' was the standard distress call. Learn how the code 'mayday' was invented in this episode of BrainStuff.

Not having a permanent address or access to identifying documents can make voting in U.S. elections nearly impossible. Learn more about these challenges -- and what some organizations are doing to help -- in this episode of BrainStuff.

The surviving records about who Druids were and what they did aren't considered reliable. Learn what we know and don't know about Druids in this episode of BrainStuff.

Meteors can put on a spectacular show, but many of the pieces of debris that cause them are the size of pebbles -- or dust. Learn more about meteorites in this episode of BrainStuff.