5 of the world’s toughest unsolved maths problems
7 February 2019
The Open Problems in Mathematical Physics is a list of the most monstrous maths riddles in physics. Here are five of the top problems that remain unsolved
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Premium
It now costs more to make bitcoin than the cryptocurrency is worth
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Producing a single bitcoin now costs $4060 on average, but it is currently valued at less than $3500
The instability of past ecosystems shows we must cut emissions now
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A model of how Earth has responded to climate changes over the past 800,000 years reveals just how sensitive our planet is to change
The truth about generations: Why millennials aren't special snowflakes
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We increasingly form opinions about people based on the generation they belong to, but these labels are often lacking in science
You say tomato
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What creates accents? Is it purely psychological, or is there some physiological element in play?
Many ridges to cross
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Back roads in Australia often have hundreds of metres of gravel corrugations, or ridges. They are always a few centimetres high, spaced about 30 centimetres apart... and annoying for vehicle occupants. What causes them?
Skipping time
6 February 2019
My 9-year-old son and I have noticed that skipping seems like a more efficient form of locomotion than jogging. It is quicker, less tiring and hurts the knees less. Are we imagining this or is there an explanation? And can we make it socially acceptable...
Molar twinge
6 February 2019
What is that weird feeling I get when I place a metal spoon on my teeth?
Feedback: Paying through the nose for someone's used tissues
6 February 2019
Illness is the latest on demand service. Plus: canine wine, zero-G coffee, a very lonely duck, the return of nominative determinism, and more
Quick crossword #27
6 February 2019
Compiled by Richard Smyth
