Instead, you socket one of two hot-swappable lithium-ion battery cartridges into the back of themouse, and put thesecond in a charging station that doubles as the 2.4GHz wireless transmitter and holds additional weights for the Rat as well.
Thesecond half was much more of a cat-and-mouse affair, but predictably it was Rooney who gave United the advantage when he struck with 16 minutes left.
The researchers identified distinct clusters of pitch changes in the songs by analysing a set of 750 syllables produced by one mouse in a single 210-second recording.