The advice, which may even be on the label your plant came with, makes intuitive sense. But it disobeys the laws of physics. Following it could end up waterlogging the soil and suffocating your plant's roots. It all comes down to water's surface tension. "Water is held up in narrow spaces with a strength that is inversely dependent on the width of the space," says Martin Chaplin of London South Bank University. As a result, it will not move easily from the narrow spaces between dirt particles to the wider ones that separate gravel. 34- ★38★★★★★★ S.O.S. Save Our Secrets Michael Brooks$1; $1@; ; THE online message board is littered with enigmatic statements. "The DME system does not reach the claimed level of security," says one. "We looked at the EdonK KEM and found an attack," declares another. If that sounds vaguely ominous, think again - it is even worse than it seems. The message board is a blow-by-blow account of an ongoing battle between humans and machines. At stake is nothing less than the cybersecurity that underpins modern society. If we lose, then everything from our WhatsApp chats and medical records to government secrets will be wide open to attack. Nothing will be safe.
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