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Living in a simulation wouldn't get rid of the need to solve climate change – in fact, it may amplify it. If reality is a simulation, then it must have been created for some purpose. Since the most common use of simulations is research, it is possible we have been created to answer some question …

Sending humans into space is a total waste of time and money. What should we do with the funds instead? Give some to columnist Chanda Prescod-Weinstein to keep the Chandra X-ray Observatory running. The rest can be spent on many more scientific instruments that need funding ( 24 August, p 20 ).

You report that a blob of jelly can play the game Pong thanks to a basic memory. To me, this implies some form of synthetic cognition, especially since the polymer used utilises ion transport, the same "technology" employed throughout the human body, including the brain ( 31 August, p 13 ). This and similar experiments …

A reader's suggestion of encouraging healthy mobility in an office by designing a necessity for longer walks seems innovative, but surely stores such as IKEA have been doing this for decades. However, the health gain of being shunted past acres of bedding and lighting to get to a dinner plate might be negated by the …

Evidence seems to contradict the proposed realistic interpretation of quantum mechanics ( 7 September, p 32 ). That evidence is Nobel laureate Anton Zeilinger's "entanglement transfer" experiment. It involves two entangled pairs of photons. The polarisation of one of each pair is separately measured. Only much later, after either passing through a device that entangles …

The maiden voyage of the sailing cargo ship Anemos, with its load of cognac and champagne, is excellent news. However, bulk transport of iron ore etc., which accounts for a large chunk of maritime emissions, must also be made in vessels that use wind as a primary power source ( 7 September, p 15 ). …

You report that individuals in numerous species, including a type of marmoset, seem to call members of their group by name. This suggests they have a concept of individual identity. While people argue about whether computers will ever be conscious, shouldn't we be passing laws to establish the rights of non-human animals who already show …

While computer modelling of smoother "eco-driving" shows a reduction in emissions, the question of how to encourage it remains. There are some ideas from the cycling world. One city placed indicator lights on a major street's bike lane 110 metres in advance of a traffic light for riders that signalled how long until the signal …

Your cover story asserts that we are reclaiming reality. Yet our notion of reality has never really made sense and it has taken quantum physics to discover that. A "thing" with "properties" is actually an infinite regress. And now there might be a "Cheshire cat" effect – properties without their particle "thing" ( 17 August, …

You report that the Woodside engineers call NASA's Valkyrie robot "Val" and talk about it in feminine terms. For anyone wondering why, the valkyries were female beings in Norse myths ( 14 September, p 14 ).