500-year-old maths problem turns out to apply to coffee and clocks
Light reflecting off the round rim creates a mathematically significant shape in this coffee cup Sarah Hart The following is an extract from our Lost
Heavy or painful menstrual periods are linked to worse exam results
Heavy periods may result in time off school and worse exam grades if girls lack the products they need Caiaimage/Chris Ryan/iStockphoto/Getty Images Menstrual periods that
Dozens of stars show signs of hosting advanced alien civilisations
Sufficiently advanced aliens would be able to capture vast quantities of energy from their star using a massive structure called a Dyson sphere. Such a
How to see tonight’s northern lights – the strongest in 20 years
People across the UK and US may glimpse a special light show tonight Marc Hilton/iStockphoto/Getty Images The aurora borealis, or northern lights, are expected to
Doughnut-shaped swirls of laser light can be used to transmit images
Smoke rings are similar to the vortices created in laser light Yevhen Rychko / Alamy Stock Photo Short pulses from a laser can be twisted