He's been working intensively with trainers to improve the external rotation of his left hip.

WSJ: Sean Foley, Eclectic Golf Whisperer

He went to spring training this year with the Marlins but got reassigned to minor league camp March 13 and was ticketed for Double-A Jacksonville before injuries to Henderson Alvarez and Nathan Eovaldi left two holes in the rotation.

WSJ: Marlins lose to Mets, waste Fernandez's fine debut

For example, Neutron stars, the ultra-compact bodies left over when massive stars explode, are thought to have rotation properties similar to those seen in superfluids.

BBC: Magnet repelled over superconductor, SPL

But that squad rotation left Arsenal looking ragged in the opening stages, with a lack of cohesion causing possession to be wasted frequently and a nervous-looking back line leaving Wenger's side exposed against the pace of N'Zogbia and power of Hugo Rodallega.

BBC: Wigan 2-2 Arsenal