What causes cavities? - Mel Rosenberg
AdultsEducationHealthHumanScienceHistory... When a team of archeologists recently came across some 15,000-year-old human remains, they made an interesting discovery: the teeth of those ancient humans were riddled with holes.
The 3 Reasons This Tree Has Lived 5000 Years
AdultsHistoryLifeNatureScienceEnvironment... Methuselah’s environment lacks nutrients, water, and oxygen. In other words, it’s the perfect place to grow very very old.
When are you actually an adult? - Shannon Odell
AdultsHistoryHumanLifePsychology... Explore how scientists define adulthood, and find out if there’s a specific age at which we reach maturity.
Saving Wild Salmon Populations
AdultsAnimalsHistoryHumanEnvironmentWildlifeFilm... In her film 'Salmon Reflection' Norwegian and Unangax̂ filmmaker Anna Hoover explores the effects of a changing world on the communities of Bristol Bay, one of the last surviving wild salmon ecosystems.
When Was The Worst Time In History To Die?
AdultsHealthHistoryHumanScience... By combining historical demography and epidemiology, we can (sort of) determine how people throughout history have died.
Explore the three main ways viruses can be driven to extinction, and dig into the possibility of COVID-19 dying out.
AdultsHealthHistoryHumanScience... Viruses are wildly successful organisms. There are about 100 million times as many virus particles on Earth as there are stars in the observable universe.
I tested the US Military’s secret space weapon
AdultsConstructionHistoryScienceSpaceTechnology... An engineer came up with a plan to drop tungsten telephone poles from space - the idea has been seriously considered on multiple occasions, so we tested it.
Anthropology’s Greatest Hoax
AdultsHistoryHumanScienceCulture... Scientists are sometimes deemed objective observers of the world in which we live, but that’s not entirely true. They’re still human and can find themselves victim to fraudsters just like the lot of us.
Machu Picchu 101 | National Geographic
AdultsNatureTravelWorldHistoryCulture... Machu Picchu is a testament to the power and ingenuity of the Inca empire. Built without the use of mortar, metal tools, or the wheel, Machu Picchu stands as an archaeological wonder of the ancient world. But why was it built—and deserted?
What makes a poem … a poem? - Melissa Kovacs
AdultsHistoryHumanSelfWritingArt... What exactly makes a poem … a poem? Poets themselves have struggled with this question, often using metaphors to approximate a definition. Is a poem a little machine? A firework? An echo? A dream? Melissa Kovacs shares three recognizable characteristics of most poetry.
Valkyries: The Real Story Behind These Warriors of Legend | Fate & Fabled
AdultsHistoryWritingCulture Vikings were some of the fiercest fighters in human history, using their impressive battle prowess to spread Norse influence between the 8th and 11th centuries.
The Future of Public Health: Crash Course Public Health #10
AdultsHealthHistoryHumanEducationFuture... We don’t know what the next big scientific breakthrough is going to be or what futuristic diseases we’ll encounter. But when it comes to our health, we actually have a pretty good idea of what could be next.
Flavor Science: What's Really in a Pumpkin Spice Latte
AdultsFoodFunHistoryScience... If you take a look at an ingredients list, odds are you’ll find natural and artificial flavors somewhere in there.
Which Healthcare System is Best?
AdultsHealthHistoryHumanPolitics... Are you ready for the understatement of the century? Health care is complicated. Across the 200 or so countries on Earth, there are a lot of different ways people receive health care.
These companies with no CEO are thriving
AdultsBusinessEconomyHistoryStartups... Get to know the different kinds of co-ops, how they work, and how they differ from traditional companies.
The Deadliest Virus on Earth
AdultsHealthHumanScienceNatureHistory... In the 1970s thousands of Chickenheads rained from the sky in Europe, making foxes and other wildlife confused and very happy. Why?
Truth Decay
AdultsHistoryHumanPsychologyPoliticsSociety... Trust is eroding, in part, due to the over-abundance of opinion-based content; we must all develop better tools and habits for consuming information to regain a shared understanding of what is true.
Greatest Last Stands In History
AdultsEducationHistoryHuman There have been countless bloody battles in history, but sometimes the outnumbered army can find a way to come out victorious! Don't miss today's epic video all about the underdog to discover the greatest "Last Stands" in history!