Crash Course
Migrations and Intensification Crash Course Big History 7
In which Hank and John Green teach you about humanity conquering the Earth. Or at least moving from Africa into the rest of the Earth. As human beings spread out across the world and populations grew, humanity reached a critical mass of...
TED Talks
TED: 4 ways we can avoid a catastrophic drought | David Sedlak
As the world's climate patterns continue to shift unpredictably, places where drinking water was once abundant may soon find reservoirs dry and groundwater aquifers depleted. In this talk, civil and environmental engineer David Sedlak...
Crash Course
Early Computing: Crash Course Computer Science
Hello, world! Welcome to Crash Course Computer Science! So today, we’re going to take a look at computing’s origins, because even though our digital computers are relatively new, the need for computation is not. Since the start of...
TED-Ed
TED-Ed: The last living members of an extinct species | Jan Stejskal
In the savannahs of Kenya, two female northern white rhinos, Nájin and Fatu, munch contentedly on grass. They are the last two known northern white rhinos left on Earth. Their species is functionally extinct— without a male, they can't...
MinuteEarth
These Names Can Kill Animals
Just like the names of products and companies, animals' names can affect how we feel about them...and changing the name of a species might actually help us save it. ___________________________________________ Credits (and Twitter...
Bozeman Science
Logistic Growth
Paul Andersen explains how populations eventually reach a carrying capacity in logistic growth. He begins with a brief discussion of population size ( N ), growth rate ( r ) and exponential growth. He then explains how density dependent...
TED Talks
TED: A new understanding of human history and the roots of inequality | David Wengrow
What if the commonly accepted narratives about the foundation of civilization are all wrong? Drawing on groundbreaking research, archaeologist David Wengrow challenges traditional thinking about the social evolution of humanity -- from...
TED Talks
TED: The world in 2200 | Pete Alcorn
In this short, optimistic talk from TED2009, Pete Alcorn shares a vision of the world of two centuries from now -- when declining populations and growing opportunity prove Malthus was wrong.
Bozeman Science
Microevolution
Paul Andersen defines microevolution as any change in the frequency of the allele pool. He then explains the five mechanisms of evolution; small sample size, non-random mating, mutations, gene flow and natural selection.
TED-Ed
TED-Ed: How one of the most profitable companies in history rose to power | Adam Clulow
During the 17th century, the Dutch East India Company cornered the booming spice market and pioneered trade routes between Asia and Europe. It is widely considered the most profitable corporation ever created. But such success came with...
TED-Ed
TED-ED: History through the eyes of the potato - Leo Bear-McGuinness
Baked or fried, boiled or roasted, as chips or fries; at some point in your life you've probably eaten a potato. But potatoes have played a much more significant role in our history than just that of the dietary staple we have come to...
TED Talks
TED: The symbols of systemic racism -- and how to take away their power | Paul Rucker
Multidisciplinary artist and TED Fellow Paul Rucker is unstitching the legacy of systemic racism in the United States. A collector of artifacts connected to the history of slavery -- from branding irons and shackles to postcards...
Bozeman Science
Populations
Paul Andersen explains how populations interact in an ecosystem. The symbiosis of several populations is based on effects that may be neutral, positive, or negative. Interactions like mutualism, commensalism and parasitism are included....
Bozeman Science
Vaccines and Herd Immunity
In this video Paul Andersen explains how immune individuals in a population give the entire group a herd immunity. Concepts of immunity, vaccines, basic reproduction number, and herd immunity threshold are discussed.
TED-Ed
TED-Ed: Does your vote count? The Electoral College explained - Christina Greer
You vote, but then what? Discover how your individual vote contributes to the popular vote and your state's electoral vote in different ways--and see how votes are counted on both state and national levels.
TED Talks
TED: Your kids might live on Mars. Here's how they'll survive | Stephen Petranek
It sounds like science fiction, but journalist Stephen Petranek considers it fact: within 20 years, humans will live on Mars. In this provocative talk, Petranek makes the case that humans will become a spacefaring species and describes...
TED Talks
Laura Carstensen: Older people are happier
In the 20th century we added an unprecedented number of years to our lifespans, but is the quality of life as good? Surprisingly, yes! Psychologist Laura Carstensen shows research that demonstrates that as people get older they become...
SciShow
The Common Houseplant That Hasn’t Flowered in Almost 60 Years
The pothos plant grows really well in a lot of places, so you’d think they’d be easy to coax blossoms out of, but even the greenest thumbs haven’t seen this plant bloom naturally in over 60 years! Why are the pothos petals so shy?
MinuteEarth
Why Are There So Many Tigers In Texas?
Why there will likely soon be more tigers in backyards in Texas than in the wilds of Asia.
SciShow
Why Sex?
Hank gets into why sex is the preferred method of reproduction for most species - and it's not for the reasons you're thinking.
SciShow
3 Facts About Lemmings
Lemmings are small, thickset vole-like animals that live in the Arctic tundra. They live in a harsh environment, are super-cute, kinda mean, and totally misunderstood.
Bozeman Science
Population Modeling
Paul Andersen shows you how we can use a spreadsheet to model population changes. He begins with a brief discussion of populations and life cycles. He then shows you how you can model a single generation using a spreadsheet.
Bozeman Science
Response to External Environments
Paul Andersen explains how organisms respond to the external environment. He begins with a discussion of behavioral responses like hibernation and migration. He ends with a discussion of physiological responses like shivering and...
Bozeman Science
Exponential Growth
Paul Andersen explains how populations experience exponential. He begins by address the major players; N (population size) and r (growth rate). He models population growth in rabbits through four generations. He then shows you how to use...