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Tag: proxy

Pyrite isn’t a reliable proxy for Earth’s oxygenation, study says

Pyrite isn’t a reliable proxy for Earth’s oxygenation, study says

Science
Feb. 26 (UPI) -- When did Earth first acquire large amounts of oxygen? What did the planet's earliest microbial communities look like? Many of the secrets of primordial Earth -- its climate conditions and biochemical composition -- are hidden in layers of marine sediments. To reconstruct Earth's past, scientists rely on certain chemical signatures preserved in the grains of sedimentary rocks. Advertisement Now, new research suggests at least one of those signatures, a mineral called pyrite, is unreliable as a proxy for ancient oxygen levels. Pyrite, an iron sulfide formed in the presence of bacteria, operates as a strong control on oxygen accumulation in Earth's oceans and atmosphere, but it turns out that control is highly localized. According to a new study, published Friday in the jou...
Munchausen by proxy: What you need to know

Munchausen by proxy: What you need to know

Health
The much-publicized case of Gypsy Blanchard may be the first introduction many people have to the concept of Munchausen by proxy. It’s a fascinating syndrome – and one that comes attached with its fair share of myths and misconceptions. Blanchard is serving 10 years in prison for her role in the stabbing death of her mother, who forced her to use a wheelchair she didn't need and subjected her to unnecessary treatments for years. Some professionals have speculated that Blanchard’s mother Dee Dee Blanchard may have had Munchausen by proxy. Below are answers to some of the more common questions about this phenomenon. Munchausen by proxy is a form of mental illness that falls under the umbrella of what are known as factitious disorders, a group of mental disturbances that includes patients ...