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The Dutch team who have grown the world's first burger in a lab say they hope to have a product on sale in five years.Researchers are to set up a company to look at making the burger tastier and cheaper

The burger is made from stem-cells: the templates from which specialised tissue such as nerve or skin cells develop.

The motivation for the research is to find ways of keeping up with the growing demand for meat. Traditional farming methods will need to use more energy, water and land - and the consequent increase in greenhouse gas emission will be substantial.

A team of researchers from the Universities of Bristol and Sussex have developed the world's first functioning sonic tractor beam able to operate outside of a lab environment.

These waves create an "acoustic hologram" (read: force field) capable of moving pea-sized objects without physically touching them. Adjusting the output of individual speakers allows the researchers to move, rotate and hold items at will.