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2022-11-12   Video
The Icefish Has Clear Blood

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SEAN CARROLL: For life to survive, it must adapt and re-adapt to an ever-changing Earth. New traits and capabilities must be invented, while some traits may be lost. [SNAKE HISSING] ...


2022-11-08   Video
The Evolution of Lactose Tolerance

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SPENCER WELLS: Only a small number of human beings live like this today. But from the time our species evolved some 200,000 years ago until the not-too-distant past, all of us lived as ...


2022-11-04   Video
Stratigraphic Principles

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JOHN SHEA: Those are nice principles. But let me give you a demonstration of this. Imagine if you will, that this is a depositive sediment. So this little ant farm-like deposit is an a...


2022-10-31   Video
Regulation of Eukaryotic DNA Transcription

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In eukaryotes, DNA transcription begins when general transcription factors bind to the promoter region of the gene. Those transcription factors facilitate the binding of the RNA polymerase enzyme to t...


2022-10-27   Video
Viral Geometry and Structural Diversity

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So shown here are three of some of my favorite viruses, I picked them for no apparent reason other than they look really cool. I've scaled them all to about the same size for easy viewing and despite ...


2022-10-23   Video
The Mosquito Life Cycle

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Mosquitoes transmit many diseases among humans, including malaria, dengue, West Nile fever, and Zika. To keep mosquitoes from spreading disease, we must first understand their life cycle. The life cyc...


2022-10-22   Pre-Intermediate
STORY - About a Place Called Gabrielle's

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There are a hundred places in New York like Gabriel's.Up front is a small bar,in back there are a few booths and a half of dozen tables,the husband is the cook,and the wife takes care of the bar.It ha...


2022-10-19   Video
The Chemical Structure of DNA

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This is a 3D model of a DNA molecule. It is made up of two strands that form a double helix. If we unwind the helix, we can see that each strand is a chain of building blocks called nucleotides. Le...


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