@HiddenCash: Twitter mystery man who leaves money to be found

The enigmatic philanthropist leaves $100 in envelopes in San Francisco as a social experiment in the redistribution of wealth – and has urged those who find the money to pass it on

Silicon Valley: an army of geeks and ‘coders’ shaping our future

My birthplace has been changed forever by the app and network generation

Green apps and gadgets: Conscious Me

It’s a growing interactive website on every subject you can think of, but how eco-conscious and useful has it become so far?

Japanese company named as biggest online retailer of ivory and whale meat

Conservation groups say Rakuten’s website carries 28,000 adverts for elephant ivory and 1,200 for whale products