Entries Categorized as 'video'

Natural Selection by Alfred Russel Wallace

January 6, 2014

Everyone knows about Charles Darwin, but hardly anyone remembers Alfred Russel Wallace, who came up with the idea of natural selection at the same time as Darwin. Darwin’s publication of the On the Origin of Species was spurred on by Wallace. Flora Lichtman and Sharon Shattuck shed a little light on Wallace with this video:

Indeed, from the introduction of On the Origin of Species:

I have more especially been induced to [publish], as Mr. Wallace, who is now studying the natural history of the Malay archipelago, has arrived at almost exactly the same general conclusions that I have on the origin of species. Last year he sent to me a memoir on this subject, with a request that I would forward it to Sir Charles Lyell, who sent it to the Linnean Society, and it is published in the third volume of the Journal of that Society. Sir C. Lyell and Dr. Hooker, who both knew of my work—the latter having read my sketch of 1844—honoured me by thinking it advisable to publish, with Mr. Wallace’s excellent memoir, some brief extracts from my manuscripts.

— Darwin, 1859. On the Origin of Species.

The Dish

Citing this post: Urbano, L., 2014. Natural Selection by Alfred Russel Wallace, Retrieved November 21st, 2017, from Montessori Muddle: http://MontessoriMuddle.org/ .
Attribution (Curator's Code ): Via: Montessori Muddle; Hat tip: Montessori Muddle.

White Blood Cell Hunts Down a Bacterium

September 4, 2013

One of my biology groups is doing a presentation on the immune system in the next few days. They decided that they needed to wander around the school asking any teacher they could find for interesting games they could use for a presentation. Mr. Schmitt, our new math teacher, recommended the neat video above of a white blood cell hunting down a bacterium. It’s pretty dramatic.

Citing this post: Urbano, L., 2013. White Blood Cell Hunts Down a Bacterium, Retrieved November 21st, 2017, from Montessori Muddle: http://MontessoriMuddle.org/ .
Attribution (Curator's Code ): Via: Montessori Muddle; Hat tip: Montessori Muddle.

Supercell

June 17, 2013

Impressive footage of a storm near Booker Texas, by Mike Olbinski.

A supercell near Booker, Texas from Mike Olbinski on Vimeo.

Citing this post: Urbano, L., 2013. Supercell, Retrieved November 21st, 2017, from Montessori Muddle: http://MontessoriMuddle.org/ .
Attribution (Curator's Code ): Via: Montessori Muddle; Hat tip: Montessori Muddle.

Sulfur Hexafluoride Density Demonstration

April 10, 2013

Sulfur hexafluoride is transparent, so if you fill a fish tank with it you can’t really see that that tank’s filled with anything other than air. However, since sulfur hexafluoride is denser than air, you can float a light boat on the invisible gas for a cool demonstration of density.

Note: Air is about 80% nitrogen gas, which has the formula N2, and a molecular mass of 28 atomic mass units: the molecular mass is the sum of the atomic masses of all the atoms in a molecule. Sulfur hexaflouride has the formula SF6 and a molecular mass of 146 amu, making it about 5 times denser than air.

Citing this post: Urbano, L., 2013. Sulfur Hexafluoride Density Demonstration, Retrieved November 21st, 2017, from Montessori Muddle: http://MontessoriMuddle.org/ .
Attribution (Curator's Code ): Via: Montessori Muddle; Hat tip: Montessori Muddle.

Alloys are (not Always) Stronger

April 9, 2013

Steel is an alloy of iron and other elements in small amounts. The exact proportions of the small amounts of other elements can make the alloy stronger, more flexible, and/or more resistant to rusting among other things. Similar alloying is used to make aluminum stronger. You’ll often hear the saying, “Alloys are Stronger” (often used as an argument for more diversity). There is a lot of fascinating research and discoveries happening in the fields of metallurgical arts and sciences at the moment. However, YouTube user NurdRage demonstrates with some gallium and an aluminum can, alloys are not always stronger.

Citing this post: Urbano, L., 2013. Alloys are (not Always) Stronger, Retrieved November 21st, 2017, from Montessori Muddle: http://MontessoriMuddle.org/ .
Attribution (Curator's Code ): Via: Montessori Muddle; Hat tip: Montessori Muddle.

The Physics of Falling Cats

April 8, 2013

Smarter Every Day uses a high-speed camera to explain the rotational physics how cats manage to spin in the air and land on their feet.

Citing this post: Urbano, L., 2013. The Physics of Falling Cats, Retrieved November 21st, 2017, from Montessori Muddle: http://MontessoriMuddle.org/ .
Attribution (Curator's Code ): Via: Montessori Muddle; Hat tip: Montessori Muddle.

Biology Videos

March 28, 2013

Sumanas, Inc. has an excellent collection of biology-related videos, including good coverage of mitosis and meiosis.

From Sumanas Inc.

Citing this post: Urbano, L., 2013. Biology Videos, Retrieved November 21st, 2017, from Montessori Muddle: http://MontessoriMuddle.org/ .
Attribution (Curator's Code ): Via: Montessori Muddle; Hat tip: Montessori Muddle.

Khan Academy: The Slope-Intercept Form of a Line

March 21, 2013

I’ve previously posted an animated illustration of the slope-intercept form, and you can use the straight lines (linear equations) app to check if you’re drawing straight lines correctly.

Citing this post: Urbano, L., 2013. Khan Academy: The Slope-Intercept Form of a Line, Retrieved November 21st, 2017, from Montessori Muddle: http://MontessoriMuddle.org/ .
Attribution (Curator's Code ): Via: Montessori Muddle; Hat tip: Montessori Muddle.

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