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.

Sigrid talks about some important words starting with "M" and gives us some tips about using many and much with countable and uncountable nouns.

Sigrid talks about a different way to say "OK," which involves the letter "L." Not everyone pronounces "L" the same way, and it can be hard to understand sometimes.

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

Sigrid introduces the letter "L" and gives us lots of examples of how it is used in words. The tricky thing is knowing when the "L" is silent.

The letter K is easy to pronounce, but there's an important exception when it's combined with one other letter in particular. Can you guess which?

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

J has just one pronunciation, except for foreign words. It usually sounds like a soft "G."

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.

Sigrid explains about pronouncing "I" in two different ways. It's easy to mix up a short "I" with a long "E" sound.

"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.