Countless inquiries have found the same problems afflicting the mental health system, but cost and access barriers still leave those seeking and providing care in despair Many Australians experience the country’s mental health system as inadequate, dangerous and financially punishing, saying they often feel unsafe in hospitals, are dismissed by health professionals and are hit with prohibitive...

Mike Whittaker has a suggestion to reduce test costs for those wishing to travel abroad, while Catherine Dunn says that if the government invested in public health infrastructure, we would have a more effective testing system Your article (Airlines warn the cost of Covid tests will stop people going abroad, 9 April) considers the cost of Covid tests for a family, calculated as the cost of a single...

The long-running series in which readers answer other readers’ questions on subjects ranging from trivial flights of fancy to profound scientific and philosophical conceptsScientists and astronomers tell us that the universe is expanding. But what is it expanding into, ie what’s beyond the universe?Phil Town, LisbonPlease email new questions to nq@theguardian.com Continue...

An exhibition at London’s Science Museum shows how far carbon capture research has comeTackling climate change may bring unexpected benefits, London’s Science Museum will reveal next month. A special exhibition on carbon capture, the fledgling technology of extracting greenhouse gases from the atmosphere and emissions from factories, will display bottles of vodka, tubes of toothpaste, pens and...