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Paramecium caudatum

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This video shows a number of paramecium feeding on some algae.  Paramecium are single celled organisms called protozoans which are common in pond water. Paramecium use tiny hair-like structures called cilia in order to move.  Imagine a tiny boat with many oars moving in unison. Several other species of protists can be seen in this video. The video was shot with a hand-held HD camera using a cell phone mount created using a 3D printer with plans from Thingiverse .
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Oxidation of Magnesium - Empirical Formula

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This video summarizes an experiment performed to experimentally determine the empirical formula of magnesium oxide. In the lab the mass of a small sample of magnesium ribbon is measured. The metal is then heated in a crucible using a Bunsen burner to speed up the process of oxidation. The reaction forms the product magnesium oxide. The mass of this compound is measured and compared to the original amount of magnesium to determine the added mass of oxygen. The data collected allows students to calculate the empirical formula of the magnesium oxide compound. The reaction is summarized by the following chemical equation. 2Mg  +  O 2  →  2MgO The compound forms with a 1:1 ratio of magnesium to oxygen. This is because magnesium has two valence electrons which are donated to the oxygen atoms. The oxygen atoms can add two electrons to complete their valence shell. I hope this was helpful.
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HS-PS2-6: Molecular Level Structure of Designed Materials

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HS-PS2-6:   Communicate scientific and technical information about why the molecular-level structure is important in the functioning of designed materials. PS2-6 Evidence Statements I introduced this topic to students by showing them a short video about gecko adhesive ( synthetic setae ).  Geckos feet are super-sticky due to numerous Van der Waals forces that form between the tiny endings of hairs that are found under their feet and whatever surface they are climbing on.  After the video we discussed the importance of molecular level interactions for the designed materials shown in the video.  Video options include the Weird Connections Episode " How Sticky is Your Gecko? ",  the segment about gecko adhesive from Nova's " Making Stuff Smarter " or  " Bio-Inspiration:Nature as Muse " from KQED-Quest. By Bjørn Christian Tørrissen - Own work by uploader, http://bjornfree.com/galleries.html, CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?c...
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