The Mindstorms Robot uses an ultrasonic sensor to identify objects within a set 2 foot range, and then it identifies an object and says "object"...if that object is in the field of range 2 seconds later then it is programmed to say "Welcome...
This video discusses the periodic table of elements, which we experience in our everyday lives, and how it relates to the rest of the universe in terms of material composition, according to astronomers
This video explains the mathematics of piano scales
An explanation of how voltage is generated by chemical batteries
Here is a song I made from combining the oxidation states of the elements on the periodic table with musical scales
Bar Charts in Excel: Here is a monster macro I made in Excel 2010 that takes raw data extracted from a Sharepoint database on the web and creates a beautiful looking Bar Chart