BrainStuff Classics: Why Does Helium Make Your Voice Squeaky?

Scorpions light up a glowing green under ultraviolet light. Science isn't entirely sure how but has a few theories on why. (Y'know, aside from "Scorpions are metal.") Learn more about scorpions' fluorescence in this classic episode of BrainStuff, based on this article: https://animals.howstuffworks.com/arachnids/why-scorpions-glow-under-black-light.htmSee omnystudio.com/listener for privacy information.

From particle physics to immunology to the ozone layer, these six scientists from the Spanish-speaking Americas redefined their disciplines with their work. Learn more in this episode of BrainStuff, based on this article: https://science.howstuffworks.com/dictionary/famous-scientists/physicists/10-hispanic-scientists.htmSee omnystudio.com/listener for privacy information.

The dodo was the first animal that we watched go extinct due to human intervention -- could it be the first animal we bring back? Learn more about the dodo and de-extinction in this episode of BrainStuff, based on this article: https://animals.howstuffworks.com/extinct-animals/dodo.htmSee omnystudio.com/listener for privacy information.

Depression is a common condition, and highly treatable, but there's still a lot we don't understand about how it works. Learn about depression's probable causes, usual symptoms, and effective treatments in this episode of BrainStuff, based on this article: https://health.howstuffworks.com/mental-health/depression/facts/depression.htmSee omnystudio.com/listener for privacy information.

To be eligible to be elected president of the United States, you have to be at least 35 years old. But why 35? And why is there no upper age limit? Learn more in this episode of BrainStuff, based on this article: https://people.howstuffworks.com/us-millennials-under-35-age-limit-president.htmSee omnystudio.com/listener for privacy information.

Doughnuts have been around in some form for thousands of years, but a lot had to happen to make them the near-ubiquitous snack they are today. Learn about the history of doughnuts in this episode of BrainStuff, based on these articles: https://recipes.howstuffworks.com/5-things-didn-t-know-about-doughnuts.htm; https://history.howstuffworks.com/historical-events/ridiculous-history-vitamin-donuts.htmSee omnystudio.com/listener for privacy information.

Owls' ability to fly almost silently gives them an air of mystery, but the science is in their wings and feathers. Learn how they do it in this episode of BrainStuff, based on this article: https://animals.howstuffworks.com/birds/owl-fly-silently.htm/printableSee omnystudio.com/listener for privacy information.

Calamity Jane has a reputation for being one of the wildest women in the Old West, but it's hard to separate historical fact from fiction. Learn more about this sharp-shooting adventurer in today's episode of BrainStuff, based on this article: https://history.howstuffworks.com/historical-figures/calamity-jane.htmSee omnystudio.com/listener for privacy information.

The Ring of Fire is a loop around the Pacific Ocean that's a literal hotbed of volcanoes, earthquakes, hydrothermal vents, and other geologic activity. Learn how the interactions among tectonic plates cause all this mayhem in today's episode of BrainStuff, based on this article: https://science.howstuffworks.com/environmental/earth/geology/ring-of-fire.htmSee omnystudio.com/listener for privacy information.

In a bustling plaza in the heart of Paris, Napoleon Bonaparte commissioned the Arc de Triomphe as a monument to his victories -- but he didn't live to see it completed. Learn more about its history in this episode of BrainStuff, based on this article: https://science.howstuffworks.com/engineering/architecture/arc-de-triomphe.htmSee omnystudio.com/listener for privacy information.