At the University of Sydney, physicist Derek Muller explores the possibility of an anti-gravity wheel through a series of field tests.

This song from Schoolhouse Rock is to help kids understand about bones. Without bones, we're just blobs. It was written by George Newall and sung by Jack Sheldon.

Anna explains when we use the present continuous, or present progressive tense and gives us some examples.

Watch this video featuring Alexander Pointer to learn the many ways of greeting people in English.

This song teaches about the digit 0, portrayed as a superhero, as well as multiplication by powers of 10. This song was voted the 11th best song on the 30th anniversary edition. Sung and written by Bob Dorough.

"H" is a tricky letter for lots of folks. Sigrid shows us how to make the sound, and gives us plenty of examples.

The letter "G" often combines with "N" to make a special sound. Sigrid explains how this works.

Sigrid talks about the hard and soft sounds for the letter "G", and gives us some practical examples with "G" at the beginning, in the middle, and at the end of a word.

Sigrid explains what a limerick is, and how to write one. If you are so inclined, you can submit your limericks in the "comments" section of the video tab.

Let's learn about pronouncing the letter "F" in various contexts.

Career expert Nicole Williams explains the most important question in an interview and the kind of answer the interviewer is looking for.

Sigrid explains various sounds associated with the letter "E."

Sigrid explains about the "hard" and "soft" sounds for the letter "C."

Sigrid finishes telling us about pronouncing the letter "B." Here's part 1 in case you missed it.

Sigrid looks at the letter "B" as followed by either a vowel or a consonant, and the sound of the double "B" as well.