Curious Kids: how do mobile phones and tablets work?

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AI could revolutionise DNA evidence – but right now we can’t trust the machines

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DNA evidence often isn’t as watertight as many people think. Sensitive techniques developed over the past 20 years mean that police can now detect minute traces of DNA at a crime scene or on a piece of evidence. But traces from a perpetrator are often mixed with those from many other people that have been transferred to the sample site, for example via a handshake. And this problem has led to people being wrongly convicted . Scientists have developed algorithms to separate this DNA soup and to measure the relative amounts of each person’s DNA in a sample. These “ probabilsitic genotyping ” methods have enabled forensic investigators to indicate how likely it is that an individual’s DNA was included in a mixed sample found at the crime scene. And now, more sophisticated artificial intelligence (AI) techniques are being developed in an attempt to extract DNA profiles and try to work out whether a DNA sample came directly from someone who was at the crime scene, or whether it had just ...
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Brain organoids help neuroscientists understand brain development, but aren’t perfect matches for real brains

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What was going on with our brain organoids? As neuroscientists , we use these three-dimensional clusters of cells grown in petri dishes to learn more about how the human brain works. Researchers culture various kinds of organoids from stem cells – cells that have the potential to become one of many different cell types found throughout the body. We use chemical signals to direct stem cells to produce brain-like cells that together resemble certain structural aspects of a real brain . While they are not “brains in a dish” – organoids cannot function or think independently – the idea is that organoid models let scientists see developmental processes that may yield insights into how the human brain works. If researchers better understand normal development, we may be able to understand when and how things go wrong in diseases. When we recently compared our lab’s organoid cells to normal brain cells, we were surprised to find that they didn’t look as similar as we’d expected. Our bra...
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AI could be a force for good – but we’re currently heading for a darker future

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Artificial Intelligence (AI) is already re-configuring the world in conspicuous ways. Data drives our global digital ecosystem, and AI technologies reveal patterns in data. Smartphones, smart homes, and smart cities influence how we live and interact, and AI systems are increasingly involved in recruitment decisions, medical diagnoses, and judicial verdicts. Whether this scenario is utopian or dystopian depends on your perspective. The potential risks of AI are enumerated repeatedly. Killer robots and mass unemployment are common concerns, while some people even fear human extinction . More optimistic predictions claim that AI will add US$15 trillion to the world economy by 2030, and eventually lead us to some kind of social nirvana . Read more: Artificial intelligence could reinforce society’s gender equality problems We certainly need to consider the impact that such technologies are having on our societies. One important concern is that AI systems reinforce existing social...
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