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Video 2022-07-27    
HIV Life Cycle

Keywords:

So this is HIV. It's a typical retrovirus, meaning that it has an outer envelope. And in the center, it has two copies of RNA, as well as an enzyme, here in blue. That's reverse tran...


Pre-Intermediate 2022-07-26    
Janis Joplin - Blues-influenced Rock Singer

Keywords:

Janis Joplin.She was one of the greatest white blues-influenced rock singers of her time.Her intense and emotional voice has become one of the most famous in American popular music.(MUSIC: "Ball and C...


British English 2022-07-26    
Deep-sea Exploration

Keywords:

JAMES CAMERON knows how to make a splash. Literally. The director of “The Terminator”, “Titanic” and “Avatar” plunged into the Challenger Deep of the Mariana Trench, 500km (300 miles) from Guam. T...


Intermediate 2022-07-25    
The Bouncing Carbon Atom

Keywords:

Steve: Right, I mean Chernobyl's terrible thing but that is not a worldwide spread, what got spewed out there. Volk: Yeah, the winds did spread it into the northern Europe and so that was very bad, b...


Video 2022-07-25    
Chilling Time - How to Build the Coolest Clock on Earth

Keywords:

I’m William D. Phillips, Bill Phillips. I won the Nobel Prize in 1997 – Nobel Prize in Physics – and I make gases of atoms really, really cold. Time is one of the most important things ...


British English 2022-07-24    
The NYPD Became a Sophisticated Counter-terrorism Agency

Keywords:

BECAUSE of the September 2001 attacks, the New York Police Department has become a sophisticated counter-terrorism agency. In the decade since then the NYPD has increased the number of detectives on a...


Pre-Intermediate 2022-07-24    
Witchcraft in Zimbabwe

Keywords:

What do you think of when you consider witchcraft? Strange powers from the spirit world? Strange people who can do things that ‘normal’ people cannot do? Magic? Where you live may influence your answe...


Intermediate 2022-07-23    
The Evolution of Evolution

Keywords:

Steve: I figured that probably had something do with it.$#10320#$10320#$ Why don't you tell everybody what the bigness is about [in] 2009.$#10320#$10320#$ Rennie: Well sure.$#10320#$10320#$ It's actu...


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