“He’s got himself into the best nick of his life,” added the coach. He has dropped a lot of weight so he is a lot leaner.

He has a massive kicking game, he’s electric on the field and he’s really demanding.

The low-frequency component of the sound travels extremely long distances, clearly audible over many miles on a quiet night.

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Glasgow head coach Dave Rennie said yesterday that Hogg, who returns to the team for this afternoon’s huge European Champions Cup clash with Leinster, is in the “best nick of his life” after four months out.

In contrast, the Greater Roadrunner bird can only hit 20mph, while, back in the human realm, the top speed ever clocked by Usain Bolt was 27.8mph in the Berlin World Championships of 2009 when he set the still-standing 100m record of 9.58 seconds.“He has been voted best player in the Six Nations for the past two years. ” said Rennie when asked how big a boost it was to have Scotland’s star player back on the park in a Warriors jersey.

This variation in its own rapid rate of spin is what produces the pitch variation.

This instrument has been used by numerous early and traditional cultures in both the northern and southern hemispheres but in the popular consciousness it is perhaps best known for its use by Australian Aborigines (it is from one of their languages that the name turndun comes).

It makes a characteristic roaring vibrato sound with notable sound modulations occurring from the rotation of the roarer along its longitudinal axis, and the choice of whether a shorter or longer length of cord is used to spin the bullroarer.

By modifying the expansiveness of its circuit and the speed given it, and by changing the plane in which the bullroarer is whirled from horizontal to vertical or vice versa, the modulation of the sound produced can be controlled, making the coding of information possible.

The aerodynamics of the roarer will keep it spinning about its axis even after the initial twist has unwound.

The cord winds fully first in one direction and then the other, alternating.

Such an explanation could be correct for an observer, but not for the user.