In the past, people thought the Earth was the center of the universe and everything revolved around it. This was a fairly ...

In those days, navigation systems were not so developed that civilisations could explore the earth much beyond their own territories. Still, every ancient civilisation had some conception of the ...

In various parts of the country, Imagined Earth has rolled out a network of reverse vending machines which reward those who deposit recyclable materials into them with credit that can be redeemed with ...