Tiny structures inspired by the shape of cactus spines allow a newly created material to gather drinkable water from the air both day and night, combining two water-harvesting technologies into one.
Nanophysics
May 20, 2021
0
304
This holiday season brings surprising news about your Christmas tree. Scientists just discovered that globally, trees growing in wetter regions are more sensitive to drought. That means if your tree hails from a more humid ...
Plants & Animals
Dec 13, 2023
0
106
Every year in the Christmas season it becomes clear again that some people are amazingly skilled singers, like Mariah Carey and George Michael. Their singing can stir strong emotions.
Plants & Animals
Dec 12, 2023
0
131
In 1997, a lone wolf crossed an ice bridge that briefly connected Canada with the remote Isle Royale, which lies off the coast of Michigan in Lake Superior and is renowned for its rich biodiversity.
Ecology
Aug 23, 2023
0
789
The success of North American crops from corn to Christmas trees partly depends on a relatively invisible component of the food web—ground beetles. Nearly 2,000 species of ground beetle live in North America. New research ...
Plants & Animals
Mar 23, 2023
0
27
For many people, holidays in the snow are as much a part of the end of the year as Christmas trees and fireworks. As global warming progresses, however, white slopes are becoming increasingly rare. Researchers at the University ...
Earth Sciences
Dec 28, 2022
1
96
Measuring only 40 micrometers in diameter, researchers at DTU Physics have made the smallest record ever cut. Featuring the first 25 seconds of the Christmas classic "Rocking Around the Christmas Tree," the single is cut ...
Nanomaterials
Dec 23, 2022
0
228
A new study finds that bird species with extreme or uncommon combinations of traits face the highest risk of extinction. The findings are published in the journal Functional Ecology.
Plants & Animals
Nov 24, 2022
0
142
The concept of ecosystem services allows researchers to quantify the benefits that nature contributes to people into monetary units. A study publishing April 5th in the open-access journal PLOS Sustainability and Transformation ...
Ecology
Apr 5, 2022
0
42
A Christmas tree with a thickness of one atom has been made at DTU. It shows how terahertz measurements can be used to ensure the quality of graphene.
Nanomaterials
Dec 23, 2021
0
133
Christmas or Christmas Day is a holiday generally observed on December 25 (with alternative days of January 6, 7 and 19) to commemorate the birth of Jesus, the central figure of Christianity. The exact birthday of Jesus is not known, and historians place his year of birth some time between 7 BC and 2 BC. Narratives of his birth are included in two of the Canonical gospels in the New Testament of the Bible.
The date of Christmas, chosen by the Roman Catholic Church in the 4th century, may have initially been selected to correspond with either the day exactly nine months after Christians believe Jesus to have been conceived, the date of the Roman winter solstice, or one of various ancient winter festivals. Christmas is central to the Christmas and holiday season, and in Christianity marks the beginning of the larger season of Christmastide, which lasts twelve days.
Although nominally a Christian holiday, Christmas is celebrated by an increasing number of non-Christians worldwide, and many of its popular celebratory customs have pre-Christian or secular themes and origins. Popular modern customs of the holiday include gift-giving, music, an exchange of Christmas cards, church celebrations, a special meal, and the display of various decorations; including Christmas trees, lights, garlands, mistletoe, nativity scenes, and holly. In addition, several figures, known as Saint Nicholas, Father Christmas, and Santa Claus, among other names, are associated with bringing gifts to children during the Christmas season.
Because gift-giving and many other aspects of the Christmas festival involve heightened economic activity among both Christians and non-Christians, the holiday has become a significant event and a key sales period for retailers and businesses. The economic impact of Christmas is a factor that has grown steadily over the past few centuries in many regions of the world.
This text uses material from Wikipedia, licensed under CC BY-SA
