January is the month of ambitious resolutions – and getting fit and losing weight tend to top the list. But how many people manage to maintain their exercise goals? Gyms are filled with enthusiastic people at the start of the month, but the numbers soon start to dwindle.

As we enjoy the festive season, many strongly-held beliefs about avoiding hangovers are thrown around. One is that mixing different types of drinks is likely to make you feel unwell during your drinking session and contribute to a worse hangover.

Brussels sprouts, like their European namesake, divide opinion. Some people embrace the flavour and familiarity of the small green vegetable. To others, they are an object of derision and disgust.

“Blue zones” are areas of the world where people live considerably longer lives. On these territories we can find octogenarians, nonagenarians and many centenarians, and even some supercentenarians (people who have reached the age of 110).

Your brain is an organ of two halves – the left side and the right side. And there are many brain functions, such as language skills or which hand you write with, which are organised mostly in one side of the brain or the other.

There is plenty of evidence that being physically active can reduce your risk of heart disease and stroke, but when do the benefits of exercise start to pay off? You might think that it’s after a few weeks – or even months – once you’ve lost some weight and your cholesterol levels have come down. But our latest review provides strong evidence that a single workout protects your heart immediately.

If you were to look in your kitchen or bathroom cabinet, the chances are you’d find some unused medicine.

The Scottish geologist James Hutton made a proposal in 1788 that, at the time, was extraordinarily controversial. He described Earth as a “beautiful machine”, constantly subjected to long-term decay and regeneration, that could only be understood over many millions of years. This may not sound that contentious, but the challenge this posed to humanity’s sense of time was substantial. Popular contemporary estimates of Earth’s age, such as Bishop Ussher’s calculation that it was created in 4,004 BC, were dwarfed by the magnitude of what Hutton described.

There are two main strategies.The first is to decrease the overall biomass of microbes – that is, decrease the amount of bacteria, viruses and other types of microorganisms. We do this by lathering with soap and rinsing with water. Soap’s chemistry helps remove microorganisms from our hands by accentuating the slippery properties of our own skin.

Changing someone’s genetic programming is easier than you might think. While techniques for altering DNA at the molecular level are becoming more widely used, it’s also possible to simply turn genes on or off without permanently changing the underlying genetic material. That means we can affect the genetic instructions that get sent to an organism’s body by changing its environment or with drugs.

Many people fear death partly because of the perception they might suffer increasing pain and other awful symptoms the nearer it gets. There’s often the belief palliative care may not alleviate such pain, leaving many people to die excruciating deaths.

Getting a good sleep can be tough, and this can lead to feeling less than refreshed when you wake up in the morning. Falling asleep and waking up are brain processes we don’t fully understand, but research suggeststhese transitions are a lot more gradual than the flip of a switch.

Folk medicine has favoured apple cider vinegar for centuries and many claims are made for its supposed benefits.

A recent headline in the Australian newspaper claimed “A short black a day can keep heart attack at bay”

Scientists achieved astonishing results when training a student with a memory training programme in a landmark experiment in 1982. After 44 weeks of practice, the student, dubbed SF, expanded his ability to remember digits from seven numbers to 82. However, this remarkable ability did not extend beyond digits – they also tried with consonants.

In the long view, modern history is the story of increasing rights of control over your body – for instance, in matters of reproduction, sex, where you live and whom you marry. Medical experimentation is supposed to be following the same historical trend – increasing rights of autonomy for those whose bodies are used for research.

My optometrist once told me that a research job can be tough on the eyes. When you aren’t reading articles, you’re staring at data or puzzling your way though code on some blinking monitor. I wear contacts. She told me to bring my glasses to work, as a backup in case my eyes tired out.

Benjamin Franklin once quipped: ‘There are three things extremely hard: steel, a diamond, and to know oneself.’ Every decision we make, from pinpointing the source of a faint sound to choosing a new job, comes with a degree of confidence that we have made the right call. If confidence is sufficiently low, we might change our minds and reverse our decision. Now scientists are using these choice reversals to study the first inklings of self-knowledge. Changes of mind, it turns out, reflect a precisely tuned process for monitoring our stream of thoughts.