The festival raises money for Greenpeace, Oxfam and Water Aid, while Mr Eavis' other green measures include recycling food waste on the working dairy farm, meaning he has not needed to use chemical fertilisers for almost 40 years.

BBC: Glastonbury tickets are 90% sold

The new guidelines clarify that written parental consent is not needed for each activity and encourage schools to use a new one-off consent form signed once when a child starts at a school.

BBC: School trip red tape 'to be cut' by Michael Gove

Many C3 plants, meanwhile, have several of the genes needed for C4 photosynthesis, but do not use them in the same way.

ECONOMIST: Genetic modification

But in real-life use, quats in their dry state may not effectively kill bacteria as moisture is needed for their action, he adds, or they could rub off or get covered by dust.

WSJ: How Alcohol-Free Hand Sanitizers Hold Up

Geothermal power plants do not require fuel, are largely unaffected by weather and use a comparatively small share of the land and freshwater needed for most other energy facilities.

FORBES: Scaling Geothermal in Central America

Going a bit further, the Comptroller's office released two previously undisclosed letters from 1993, the first acceding to a bank's request to hold a condominium for its own use and the second allowing the bank to rent it out when it was not needed.

ECONOMIST: American banks and property

Folks increasingly found they needed a personal mobile phone as well as the corporate phone, because they did not want to use the Blackberry for personal use.

FORBES: Research in Motion: Too Little - and Far too Late Playbook

But unfortunately for Swartz, MIT apparently could not countenance the use of its (deliberately open) network for such purposes, giving federal prosecutors the reason they needed to bring Swartz to trial.

FORBES: A Bit Of The Future Was Lost With The Tragic Death Of Aaron Swartz