The benefits of good posture

Has anyone ever told you, “Stand up straight!” or scolded you for slouching at a family dinner? Comments like that might be annoying—but they’re not wrong. Your posture is the foundation for every movement your body makes and can determine how well your body adapts to the stresses on it. Murat Dalkilinç gives the pros of good posture. 

Lesson by Murat Dalkilinç, animation by Nadav Arbel. A TedEd lesson!

Are we running out of clean water?

Let’s Begin…
Despite water covering 71% of the planet’s surface, more than half the world’s population endures extreme water scarcity for at least one month a year. Current estimates predict that by 2040, up to 20 more countries could be experiencing water shortages. These statistics raise a startling question: is the Earth running out of clean water? Balsher Singh Sidhu takes a closer look at water consumption.

A very informative video by TedEd. You can also access the video following this link.

Some words:
cover = καλύπτω
Earth's surface = επιφάνεια της Γης
population = πληθυσμός
endure = υπομένω
water scarcity= water shortage = έλλειψη / ανεπάρκεια νερού
run out = ξεμένω, εξαντλούμαι
consumption = κατανάλωση
footprint = αποτύπωμα
impact = αντίκτυπος

You can look up other unknown words on this online dictionary.

Then answer the following questions.

How many verb tenses are there in English?

How many different verb tenses are there in a language like English? 
At first, the answer seems obvious — there’s past, present, and future. 

But it isn't quite that simple. 

In this TEDed lesson, Anna Ananichuk explains how thanks to something called grammatical aspect, each of those time periods actually divides further.

The Origins Of The London Underground

London has the oldest underground railway in the world! 
Londoners call it the "tube"!

It was the dawn of 1863, and London's not-yet-opened subway system — the first of its kind in the world — had the city in an uproar. 

Most people thought the project, which cost more than 100 million dollars in today's money, would never work. So how did they do it? 

Christian Wolmar explains how the London Underground was built at a time when no one had built a railway under a city before.

A very interesting lesson by TEDEd.

Further down you can find a tube map to see how much it has evolved!

The origins of the English Language

When we talk about 'English', we often think of it as a single language. But what do the dialects spoken in dozens of countries around the world have in common with each other, or with the writings of Chaucer? Claire Bowern traces the language from the present day back to its ancient roots, showing how English has evolved through generations of speakers.

A very interesting TEDEd lesson.