Decades of public health messages have encouraged us to drink milk to strengthen our bones and reduce the risk of fractures as we age.

But dairy products have recently come under fire – and not just from paleo dieters and animal welfare supporters. Researchers have linked high milk intakes to bone fractures, cancer and premature aging.

It seems as though no other substance occupies so much of the world’s land, for so little benefit to humanity, as sugar. According to the latest data, sugarcane is the world’s third most valuable crop after cereals and rice, and occupies 26,942,686 hectares of land across the globe. Its main output – apart from commercial profits – is a global public health crisis, which has been centuries in the making.

The use of prescription-only painkillers by athletes is hardly new, but debate about their (ab)use in Australia has recently been brought into focus by the emergency hospitalization of South Sydney NRL players Aaron Gray and Dylan Walker, both of whom suffered a life-threatening reaction to a combination of controlled drugs. These athletes were recovering from post-season surgery to address injuries, with painkillers prescribed by their surgeons to assist with post-operative discomfort.

Antioxidants have made a fortune for the dietary supplement industry, but how many people really know what they are and why they’re supposedly good for you? One common claim is that the these molecules can protect you from cancer. This is supposedly because they can counteract other molecules known as “reactive oxygen species” or “free radicals” that can be created in our cells and then damage DNA, potentially leading to cancer.

Since their first use in the 1960s, there has been a tremendous expansion of laser technology into an impressively wide range of uses, from fundamental science, health care and security to entertainment. Since Theodore Maiman’s first working laser at the Hughes Research Laboratory in 1960 more than 55,000 patents on laser technology have been filed in the United States alone.

Bipolar disorder is a diagnosis given to people who experience periods of intense low mood but also periods of elation and increased energy which can lead to impaired judgement and risky behaviour. The Royal College of Psychiatrists estimates that around 1% of the adult population experience bipolar symptoms at some point in their life.