C1 exam for teachers

The call for the C1 exam for teachers has just been published. Here's the link

10 Scientific Breakthroughs That Will Change Your Life

• pincers:a tool made of two pieces of metal with blunt concave jaws that are arranged like the blades of scissors, used for gripping and pulling things.a front claw of a lobster, crab, or similar crustacean.
• stemcell:  an undifferentiated cell of a multicellular organism which is capable of giving rise to indefinitely more cells of the same type, and from which certain other kinds of cell arise by differentiation.
• geneticist: a person who studies or specializes in genetics
• crop: (Agriculture) the produce of cultivated plants, esp cereals, vegetables, and fruit. 

Lay vs Lie

Here is a link to a .pdf file
Here is another activity
Here is an explanation

Inversion Transformations

Here's the explanation
Here's a link to a very useful exercise to practise inversions

And another one
And a 3rd one

Chris Rock's Jokes

tux: tuxedo, a dinner jacket
outfit: A set of clothing, often with accessories