Cingulate cortex | Arm Holdings chip designs | What is a sister ship | Tweeting from employment tribunal
• An account of watching a brain dissection said that one of the first areas of the brain to be affected by Parkinson's is the "singular cortex", at the corner of the frontal lobes. That should have been the cingulate cortex ('Dissecting brains is pretty intense', 28 March, page 6, G2).
• In an article about a design by Arm Holdings for an ultra-low-power microcontroller, it was said that Arm "has been producing 8 and 16-bit micro-processors since 2007". The company never provided 8- and 16-bit technology, its designs having focused from the start on 32-bit (British tech firm unveils chip that could connect fridges and forests to internet, 13 March, page 23).
• A reader rightly points out that common ownership does not necessarily a sister ship make: "[You refer] to the Costa Allegra as the 'sister ship' of the Costa Concordia (Helicopters take aid to stricken Costa Allegra, 29 February, page 18) … While the Costa Allegra is owned by the same company as the Costa Concordia and therefore part of their fleet, it is not a sister ship of the Costa Concordia. A sister ship is a ship of the same class, the same basic design." Thus, he notes, the Costa Concordia is a Concordia class ship so its sisters are the Costa Serena, Carnival Splendor, Costa Pacifica, Costa Favolosa and the Costa Fascinosa. The Costa Allegra, on the other hand, was originally an Axel Johnson class container ship later converted to a cruise liner. "There were five ships in the Axel Johnson class of which the Costa Allegra and Costa Marina are now sister cruise ships."
• Live justice live blog: day one – which was writing from employment tribunals – was corrected because an entry at 10.27am said that reporter Graham Snowdon was asked to step outside the tribunal room while officials checked that he was allowed to continue. In fact, the hearing was temporarily adjourned by the judge, during which time Snowdon asked a customer services manager if she could inform the judge of his intention to tweet proceedings. Snowdon was then asked to remain outside the hearing room after the hearing had resumed, while the customer services manager verified his right to do so. He was allowed back into the hearing at about 10.55am.