Children who suck their thumb or bite their nails are less likely to develop allergies, a study suggests. The explanation, say the authors in the journal Pediatrics , is the hygiene hypothesis - exposure to some germs strengthens the body's immune system. Thumb-sucking and nail-biting appeared to prevent some allergies among the 1,000 people in New Zealand assessed periodically between ages five and 32. But the habits had no bearing on either asthma or hay-fever risk. Thumb-sucking and nail-biting was assessed and recorded at ages five, seven, nine and 11, and allergies were tested for at age 13 and 32. About a third of the children were frequent thumb-suckers or nail-biters, and these children were significantly less likely to have allergies at the age of 13. The odds of these children developing an allergy to things such as house dust mite or a pet cat or dog was about a third lower than those of the other children who did not have these habits. And this p...
. Universal Plug Adaptor Electrical systems differ around the world - both in voltage and less critically, frequency. The physical interface (plugs and sockets) are also different and often incompatible. However, travellers with electrical appliances can take a few steps to ensure that they can be safely used at their destination. Voltage and Frequency Map of the world coloured by voltage and frequency Start by taking a look at the back of the device you want to use. If it says something like " 100-240V, 50/60 Hz ", it will work anywhere in the world with the right plugs. If you've got both covered, you can skip to the next section. If not, keep reading. Dealing with electricity differences can be daunting, but it actually isn't too hard. There are only two main types of electric systems used around the world, with varying p...
Water vapor on Ganymede Scientists have found the first evidence of water vapor on Ganymede, a world orbiting Jupiter and the largest and most massive moon in our solar system. They said this discovery is a step toward understanding the habitability of moons orbiting giant planets. At noon around Ganymede’s equator, temperatures apparently get warm enough for parts of the moon’s icy crust to sublimate. That is, the ice goes directly from a solid to a gas, releasing water vapor. The researchers made the discovery with the help of archival data from the Hubble Space Telescope, together with some new data. They published their findings on July 26, 2021, in the peer-reviewed journal Nature Astronomy. In 1998 and 2010, the Hubble Space Telescope observed Ganymede in ultraviolet ( UV ) light. Images from both observations revealed an aurora zone for Ganymede, a sign that this large moon has a permanent magnetic field, produced by an iron core. Ganymede also orbits within Jupiter’...
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