Brainstuff

Carmine is a vibrant, long-lasting red dye that's extracted from crushed cochineal insects. Learn about the intriguing history and modern use of carmine in this episode of BrainStuff. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Nailing down what makes a continent a continent is a surprisingly tricky business. Learn more about how we humans have defined landmasses, past and present, in this episode of BrainStuff. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Dr. Ignaz Semmelweis asked fellow 19th-century doctors to wash their hands between conducting autopsies and delivering babies -- and was ridiculed for it. Learn how he and other sanitation pioneers helped save lives anyway in this episode of BrainStuff. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

In commensal biological relationships, one organism benefits from another's work without harming (or, often, even alerting) the worker organism. Learn more about commensalism in this episode of BrainStuff. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Spoiler Alert: Yep, dry cleaning isn't dry. Instead, it uses a petroleum solvent in place of water. Learn more about dry cleaning in this classic episode of BrainStuff. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Water is made up of hydrogen and oxygen, but in a form that we can't breathe. Learn more about how water works in this classic episode of BrainStuff. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Juneteenth is a holiday celebrating Black American independence and commemorating the ongoing struggle for equality. Learn the history of Juneteenth in this episode of BrainStuff. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Preference for using one hand over the other is both genetic and learned during childhood -- but can we change that later in life? Learn about how handedness and ambidexterity work in this episode of BrainStuff. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Though it started as an obscure legal term, intersectionality has become the matter of some debate. Learn what it means and how it can help everyone out in this episode of BrainStuff. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

These small, grey garden critters go by many names and are more helpful than you might think. Learn about roly-poly 'bugs' (they're actually land crustaceans!) in this episode of BrainStuff. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

The United States has never postponed a presidential election. Learn why it would be extremely difficult to do so in this episode of BrainStuff. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

What are eyebrows really good for, evolutionarily speaking -- and what would we look like if we hadn't developed them? Learn about eyebrows, sweat, and nonverbal communication in this classic episode of BrainStuff. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Lots of human mathematics are based around multiples of the number 10 -- so why do we measure time in multiples of 12? Learn more in this classic episode of BrainStuff. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

The term 'Jim Crow laws' refers to laws enacted after the U.S. Civil War to prevent emancipated slaves and other people of color from accessing their full rights as citizens. Learn the history of the term and how these laws affected society in this episode of BrainStuff. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Voting is an incredibly important way to make your voice heard, but it's very rare for a candidate to win or lose by just one vote. Learn how rare -- and about a few times that it's happened -- in this episode of BrainStuff. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

In Japan during the 1600s, some wealthy households installed purposefully squeaky floors as an alarm system. Learn how nightingale floors work in this episode of BrainStuff. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

In the long run, a black hole will consume any star that crosses its path -- but researchers have found one that should hang on for a few trillion years. Learn more about it in this episode of BrainStuff. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

Police use of tear gas at protests is controversial to begin with because it's so harmful, but these weapons may also help spread the novel coronavirus. Learn why in this episode of BrainStuff. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

We’ve all seen movies with supervillains building catastrophic Doomsday devices – but one exists in the real world, too. In this classic episode, learn how the Cold War led to the most dangerous nuclear system in history: Russia’s 'Dead Hand' Perimeter system. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.

There's a lot of hype about high-definition TV, ultra-high definition, and beyond. But does this race to jam more pixels into screens actually matter? Learn more about the human eye and digital resolution in this classic episode of BrainStuff. Learn more about your ad-choices at https://www.iheartpodcastnetwork.comSee omnystudio.com/listener for privacy information.