Fighting Drug addiction

 Here's the story: We sat down with a man who had a harrowing journey with addiction. He began by telling us about his early days in tertiary education, where he would occasionally smoke dagga with friends. However, his focus remained on his studies, and he worked hard to graduate and secure a qualification. After landing a job, he started building a life for himself. He got married, bought a property, and even splurged on a car. Life was good, and he felt like he was on top of the world. But one fateful night, while out with friends, he was introduced to heavier narcotics. At first, the experience was exhilarating. He described it as an elevation from the mild high of dagga to a level 5 high, where he felt invincible and euphoric. The effects would last for days, allowing him to party from Friday to Sunday without sleep. The problem, however, began to manifest on Mondays and Tuesdays every week, when the withdrawal symptoms would kick in, and he'd struggle to function at work....

Climate change has altered the Earth's tilt

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A photograph of Rink Glacier in Greenland, with a meltwater lake visible on top of the ice.
A photograph of Rink Glacier in Greenland, with a meltwater lake visible on top of the ice. (Image credit: NASA/OIB)

Earth's poles are moving — and that's normal. But new research suggests that within just decades, climate change and human water use have given the poles' wandering an additional nudge.

Any object's spin is affected by how its weight is distributed. Earth's weight distribution is always changing, it turns out, as the planet's molten innards roil and its surface morphs. Water is a key influencer, since it's so heavy. In the past two decades, two supersensitive NASA satellite missions — the Gravity Recovery and Climate Experiment (GRACE) and its successor — have analyzed this shifting weight, but those observations began only in 2002.

In the new research, scientists were particularly focused on shifts in Earth's tilt in the 1990s, before that satellite data existed. Instead, the researchers turned to observations of the water itself — measurements of ice loss and statistics on groundwater pumped out for human use — to combine with studies of how the poles drifted, according to a statement released by the American Geophysical Union (AGU), which published the new research in one of its journals.

Related: World's largest iceberg disintegrates into 'alphabet soup,' NASA photo shows

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And drift the poles did: In 1995, polar drift changed direction completely, and between that year and 2020, the speed of the pole movement increased about 17 times compared to the average speed measured between 1981 and 1995, according to the AGU.

By combining the polar drift data with the water data, the researchers showed that most of the pole movement was triggered by water loss from polar regions — that'll be ice melting off land and flowing into the oceans — with smaller input from water loss in other regions, where humans pull groundwater up to use.

Intriguingly, there are plenty more pole-drift observations where these came from: according to the AGU, researchers have measured the phenomenon for 176 years. Those data and the new methods could help scientists track water movement before good records of ice loss and groundwater use begin. "The findings offer a clue for studying past climate-driven polar motion," Suxia Liu, a hydrologist at the Chinese Academy of Sciences and the corresponding author of the new study, said in the AGU statement.

The research is described in a paper that was published last month in the journal Geophysical Research Letters.

Email Meghan Bartels at mbartels@space.com or follow her on Twitter @meghanbartels. Follow us on Twitter @Spacedotcom and on Facebook.

Join our Space Forums to keep talking space on the latest missions, night sky and more! And if you have a news tip, correction or comment, let us know at: community@space.com.

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