Categories
Evolution

How Wolves Change Rivers

 

NOTE: There are “elk” pictured in this video when the narrator is referring to “deer.” This is because the narrator is British and the British word for “elk” is “red deer” or “deer” for short. The scientific report this is based on refers to elk so we wanted to be accurate with the truth of the story.

“When we try to pick out anything by itself, we find it hitched to everything else in the Universe.” – John Muir

When wolves were reintroduced to Yellowstone National Park in the United States after being absent nearly 70 years, the most remarkable “trophic cascade” occurred. What is a trophic cascade and how exactly do wolves change rivers? George Monbiot explains in this movie remix.

FAIR USE NOTICE: This video may contain copyrighted material. Such material is made available for educational purposes only. This constitutes a ‘fair use’ of any such copyrighted material as provided for in Title 17 U.S.C. section 106A-117 of the US Copyright Law.

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Categories
Evolution

How Whales Change Climate

When whales were at their historic populations, before their numbers were reduced, it seems that whales might have been responsible for removing tens of millions of tonnes of carbon from the atmosphere every year. Whales change the climate. The return of the great whales, if they are allowed to recover, could be seen as a benign form of geo-engineering. It could undo some of the damage we have done, both to the living systems of the sea, and to the atmosphere.

FAIR USE NOTICE: This video may contain copyrighted material. Such material is made available for educational purposes only. This constitutes a ‘fair use’ of any such copyrighted material as provided for in Title 17 U.S.C. section 106A-117 of the US Copyright Law.

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Categories
Evolution

Project Tierra

Tom Ray is a biologist who created a unique computer program to watch evolution occur in a digital system. This is his awesome story.
This video isn’t mine, but I’m totally shocked that it’s not available on youtube, so I’m uploading it in the interests of accessibility.

 

[vc_video link=’https://www.youtube.com/watch?v=Wl5rRGVD0QI’]  
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Categories
Evolution

15 Sorting Algorithms in 6 Minutes

Visualization and “audibilization” of 15 Sorting Algorithms in 6 Minutes.
Sorts random shuffles of integers, with both speed and the number of items adapted to each algorithm’s complexity.
The algorithms are: selection sort, insertion sort, quick sort, merge sort, heap sort, radix sort (LSD), radix sort (MSD), std::sort (intro sort), std::stable_sort (adaptive merge sort), shell sort, bubble sort, cocktail shaker sort, gnome sort, bitonic sort and bogo sort (30 seconds of it).

 

[vc_video link=’https://www.youtube.com/watch?v=kPRA0W1kECg&index=4′]

 

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