From steam trains to the solar system - models of all shapes and sizes are being collected at Alexander Palace to celebrate the start of this year's London Model Engineering Exhibition.
Over 14,000 visitors are expected at the event - which is in its 21st year.
There's a shortage of software engineers. So what could encourage todays children to design the apps and websites of the future?
David Wood has been finding out.
Some of London's universities will benefit from a share of 60 million pounds in investment from the government. UCL and Imperial College London are two of those see the cash. The money will help science and engineering students set up new businesses.