Anna, from Cambridge University Press, explains how and when to use the Present Simple.

"Y" is a tricky letter because it's both a consonant and a vowel. As a vowel, it has different sounds. Don't worry. But hey, maybe keep your eye on the "Y." Don't let it fly away.

Gabrielle presents three key questions you're likely to face when being interviewed for a job. Her advice is spot on.

Do you want to prepare for that big job interview? If so, take a look. Gabrielle offers some valuable information and a few helpful hints.

"X" is a special letter in that we often use it by itself. It's useful in a lot of situations. In the middle of a word, however, it can be pronounced in a few different ways.

"W" is a consonant, but it is very vowel-like and is considered a "semi-vowel." "W" is featured in plenty of important words, and it combines with other letters to make some new sounds.

"V" is a voiced consonant. "Voice" starts with "V." We make the sound with the upper teeth lightly touching the lower lip, like "F" but with the voice, too. It vibrates. The verb "to vibrate" also starts with "V." That should make it easy to remember.

"U" is an interesting vowel, and has a few different sounds. It can even sound like the consonant "Y," and combines with other vowels to make new sounds.

"T" is for "tricky." Depending on what letters "T" is combined with or next to, it is pronounced differently. Sigrid explains and gives some examples.

Fuse School: Learn the basics about the effects of global warming on the environment. Some of the problems global warming may cause are changing climate, extremes of weather, problems for ecosystems, rising sea levels, and ocean acidification.

The letter "S" has a couple of different sounds. It's a very important letter because it's used to form the plural of many nouns as well as the third person singular of verbs.

The letter "R" is difficult to pronounce for lots of people, even native speakers. Sigrid shows us how "R" sounds in different kinds of words.

The consonant "Q" is a special letter. We almost never find it without a "U" following it. Sigrid gives us plenty of examples of how it's used.

Most of the time "P" is simply pronounced like a "P," but there are a few cases in which "P" is silent. Sigrid gives us plenty of examples of handy words with "P."

Annette explains three more colloquial contractions people use in everyday conversation: gotta [got to], gotcha [got you], and dunno [don't know]. She also gives us examples in context.

The letter "O" is a tricky vowel, because there are several ways to pronounce it, both when it's single and when it's double!

Like the letter "M," "N" is almost singable. Sigrid gives you some tips about some very important words containing the letter "N."

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?