acoustic reversal sensor

[sawna hawley]

The European Space Agency Tech Transfer program is promoting a sensor
which stick s on any hard surface and turns it into a
tap-keyboard/switch/control board:
http://glikglik.blogspot.com/2005/02/time-reversal-switch.html

 

[Kim Sleep]

Wow...the European space agency is REALLY stupid. Even I think I could
design such a thing.