Top Science Stories of 2013

From the first vat-grown hamburger to the discovery of the world's largest volcano, scientists pushed back the limits of human knowledge in 2013 and developed technologies that could radically change how we live our lives.

The Science Media Centre team, in conjunction with our colleagues at the AusSMC, have assembled the top 10 picks for the most significant international science stories of the year. Contact the SMC if you would like more information about any of these stories, including copies of the research papers associated with them.

It was also a big year for New Zealand science with researchers publishing studies in some of the world's most influential journals. See below for our Top 10 list of New Zealand science stories that captured the public's attention in 2013.

Top 10 international science stories

1. Space sounds revealed Voyager 1 had boldly gone: In September, NASA's Voyager 1 spacecraft became the first man-made object to leave our solar system and venture into interstellar space. The probe, launched in 1977 with the aim of reaching Jupiter and Saturn, is now over 19 billion kilometres from the sun. Scientists listened in to vibrations in the plasma surrounding Voyager - the sound of interstellar space - after it was hit by a massive solar wave in April. The vibrations allowed them to calculate the plasma's density, which differs between our solar system and interstellar space, confirming Voyager was no longer in our solar system.

2. Carbon dioxide hit a new peak and human influence on the climate was clearer than ever:In May, levels of carbon dioxide in the Earth's atmosphere reached a symbolic milestone, passing 400ppm (parts per million) for the first time in human history. Just a few months later in September, the leading international body for the assessment of climate change, the Intergovernmental Panel on Climate Change (IPCC), found that human influence on the climate system is clearer than ever -we are now 95 percent certain that humans are the cause of global warming. Climate scientists from New Zealand were among the more than 600 scientists and researchers who worked on the IPCC report. 3. Scientists created human stem cells using cloning techniques: In May, researchers used therapeutic cloning to create human embryonic stem cells for the first time. The process involved taking the nucleus - which contains the genetic material - from a normal cell and transferring it into an unfertilised egg with its own genetic material removed. While this approach had previously been used in monkeys and mice, it had never succeeded using human cells. This discovery, described by Australian scientists as "a major breakthrough in regenerative medicine", could help develop personalised therapies for a range of currently untreatable diseases. However, the process requires human donor eggs, which are not easy to obtain, and raises a number of ethical issues.

4. Do you want fries with that? The world's most expensive burger was grown in the lab: The world's first lab-grown burger was cooked and eaten at a news conference in London in August this year - generating headlines around the world. The burger patty - which one food critic described as 'close to meat' - was developed by scientists from Maastricht University in the Netherlands through research funded by Google co-founder Sergey Brin. Starting with stem cells from a biopsy of two cows (a Belgian Blue and a Blonde d'Aquitaine), the scientists grew muscle fibres in the lab. The fibres were pressed together with breadcrumbs and binding ingredients, then coloured with beetroot juice and saffron, resulting in the most expensive hamburger in history at a cost of around NZ$400,000.

5. Doctors stopped HIV in its tracks in the "Mississippi baby": A child born with HIV and treated with a series of antiviral drugs for the first 18 months of its life was found to be free of the virus more than 12 months after treatment ended. When the infant was 30 months of age, HIV-1 antibodies remained completely undetectable. However, the big question of whether this child, known as the "Mississippi baby", has truly been cured of HIV remains unanswered. "The best answer at the moment is a definitive maybe", HIV expert Scott Hammer, wrote in a New England Journal of Medicineeditorial which accompanied the research.

6. Redefining mental illness: In May, the new version of the diagnostic reference manual used by clinicians in the U.S. and around the world to diagnose mental disorders was released. The fifth revision of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5) is the first update in nearly 20 years and followed a decade of review and consultation. It's publication met with widespread controversy. One of its major changes is to introduce a graded scale known as Autism Spectrum Disorder combining the former four autism-related disorders: autistic, Asperger's, childhood disintegrative, and pervasive developmental disorder. Elsewhere, several new disorders were added, new suicide risk assessment scales were introduced and the threshold for diagnosing Post Traumatic Stress Disorder (PTSD) was lowered. Critics of DSM-5, including New Zealand experts, argue that it will lead to the over-diagnosis of mental disorders, stigmatising millions of people who are essentially normal.

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Top Science Stories of 2013