cement

LED: Light Emitting (whilst) Dancing

This video shows an amazing new type of light show at a recent Coldplay concert. Each audience member is given a wristband containing LEDs. These are controlled centrally so they light up in time to the music – a trully interactive experience.
Each wristband has a receiver, which allows data to be sent via radiowaves from a transmitter attached to a computer.
Showing the video would make an engaging start to a lesson on the uses of radiowaves.

Cement gets a green makeover

Image: MManson

Global cement production accounts for about 2 billion tonnes of CO2 every year – that’s 5% of all CO2 emissions and more than the entire aviation industry.
Now a company has come up with a way of producing cement actually reduces carbon dioxide emissions. More