Thought for the month

“You always own the option of having no opinion. There is never any need to get worked up or to trouble your soul about things you can't control. These things are not asking to be judged by you. Leave them alone.”
Marcus Aurelius Antonius, Emperor and Stoic philosopher (121-180).

Thursday, 24 May 2012

Whose sonic screwdriver?

I still think that Dr Who has the edge for overall usefulness, but a group at the University of Dundee have come up with their version of a sonic screwdriver. The team used an array to form an ultrasound beam that can both carry momentum to push away an object in its path and, by using a beam shaped like a helix or vortex, cause objects to rotate. The Sonic Screwdriver can be viewed rotating a rubber disc.

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