Thirty years ago our mobile phones were as big as a brick. That...

Thirty years ago our mobile phones were as big as a brick. That didn't include the battery which had a shoulder strap and was as big as a 100 series concrete block.

The first satellite phones were contained in a suitcase that was too big to take on a plane as carry on baggage.

Todays solar panels will likewise look ridiculous in 15 years time.

It won't be long before a thumb size battery charged by a thumb nail size solar panel will be all thats needed to power the driverless cars. The horse power of the future. Sounds like dreaming but not too long ago people were riding horses and dreamt of having a saddle.