Â鶹´«Ã½

Anil Ananthaswamy's feature on the possibility of a spinning cosmos (15 October, p 44) had me reaching for a copy of Austrian logician Kurt Gödel's paper on rotating universes, written to mark Albert Einstein's 70th birthday in 1949. Gödel shows the "absurdity" that results from a rotating universe, namely the ability to travel into any …

One reason for the slow uptake of electronic navigation on ships (22 October, p 26) is the lack of adoption of open standards by the major chart agencies around the world. For example, the UK Hydrographic Office (UKHO) offers chart services that will work in Electronic Chart Display and Information Systems (ECDISs); but in a …

Max Tegmark has two suggestions for what will happen to the information in an expanding universe: either information is created, meaning we can no longer make predictions; or the quantum "grain size" of the universe – the effective "Planck length" – increases, leading to a breakdown of nuclear physics that Tegmark calls the "big snap" …

In your story on the lawsuit against TransCanada's Keystone XL Pipeline in North America, the statement that our legal challenge is about "nothing more than mowing tall grass" is not accurate (15 October, p 4) . We believe it is a violation of law for TransCanada to begin any work on the proposed pipeline before …

Your article on the study of habitat fragmentation in Borneo carried out in co-operation with loggers states that 75,000 hectares of primary forest in Sabah is being cleared to develop oil-palm plantations (22 October, p 7) . This is not the case. The plantations are being developed on areas of highly degraded, effectively second-growth forests …

Your story "I'm autistic, I don't care what you think" was interesting (15 October, p 19) . I have autism, and I think researcher Keise Izuma got it right. We are more likely than neurotypicals to be consistent in our behaviour, regardless of whether we are observed or not. Incidentally, terminology has moved on. "Is …

The importance of the smell of the nipple for breastfeeding (8 October, p 12) is beautifully illustrated by a tale told to us by a midwife friend. A mother had been feeding her baby for eight days when, one morning, the baby suddenly refused to feed. It turned out the mother had washed with her …

With reference to the controversy over Tutankhamun's club foot (8 October, p 10) , Zahi Hawass, while Egypt's antiquities minister, gave an apparently convincing argument in support of the boy king having had such a condition. An extraordinary number of ceremonially anointed walking stick-shaped "batons" were found in the treasure chamber, annex and antechamber of …

The speculation, in an article on the evolution of our brains, that a dinosaur or bird could have evolved considerable intelligence instead of us was engaging (24 September, p 40) . I suggest another candidate: the dinosaurs' other flying cousins, pterosaurs, which had a high brain-to-body-size ratio compared with dinosaurs. Birds that colonise isolated islands …

You describe a wind turbine with extendable blades (22 October, p 26) . Why would they be better than blades that vary their pitch – their angle to the breeze – which are a well-understood feature of most propeller-driven aircraft?

Further to your review of Dava Sobel's book on the heliocentric theory of Copernicus (24 September, p 61) , the Polish astronomer was not alone in overturning long-entrenched beliefs. In the same era, Christopher Columbus's voyage to the New World eventually banished notions of the globe having a dark underside, academic and clerical opposition notwithstanding. …

Feedback is right to welcome the removal of the wasteful "sell-by" date from food packaging (15 October, p 64) but misses a more ironic effect. Many cheeses improve with age and are just approaching their prime at the "sell by" date, but supermarkets then reduce the price to clear their shelves. The result is that …

• In the Spaceport America story (22 October, p 12) we mistakenly said that Richard Branson is Virgin Galactic's CEO – he's the founder.