DNA from lock of hair confirms identity of great-grandson of Native American leader Sitting Bull

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Sitting Bull is known to have led 1,500 Lakota warriors at the Battle of Little Bighorn in 1876 | Communal room

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New Delhi: Scientists have confirmed that an American man claimed to be the great-grandson of the legendary Sitting Bull using DNA extracted from the lock of hair of the late Native American leader.

Sitting Bull is known to have led 1,500 Lakota warriors at the Battle of Little Bighorn in 1876, which symbolizes the resistance of the Native Americans to the government of the white man. Bull was assassinated in 1890.

Confirmation was made possible by a new method of analyzing family lines using ancient DNA fragments, developed by a team of scientists from the University of Cambridge and the Lundbeck Foundation GeoGenetics Center.

DNA from the hair has been compared to DNA samples from Ernie Lapointe and other members of the Native American tribe known as the Lakota Sioux. The resulting match confirms that Lapointe is Sitting Bull’s great-grandson and his closest living descendant. Read more

Wildfires raged in Antarctica 75 million years ago

A new study has found that Antarctica, currently a frozen desert, suffered from forest fires that raged 75 million years ago, while dinosaurs still roamed the Earth.

At the end of the Cretaceous, between 100 and 66 million years ago, Antarctic James Ross Island was warm enough to support a forest of conifers, ferns and flowering plants, as well as dinosaurs.

Just as warm climates trigger forest fires today, ancient fires have reduced parts of these forests to ashes. The leftover charcoal gave scientists the opportunity to delve into the warm, green past of the South Pole.

This is the first time that paleofires have been documented on James Ross Island, part of the Antarctic Peninsula that now lies beneath South America.

The discovery adds evidence that spontaneous fires were common in Antarctica around 84 to 72 million years ago.

For this new work, an international team of scientists analyzed fossils collected during a 2015-2016 expedition to the northeastern part of James Ross Island. These fossils contained plant fragments that looked like charcoal residue, which had eroded over tens of millions of years. Read more

Giant 400-million-year-old sea scorpion fossil discovered

Chinese scientists have discovered the fossil remains of a giant sea scorpion about three feet long that lived over 400 million years ago.

The creature resembles an enlarged scorpion, with its body decorated with needle-like spikes and a tail that resembles a serrated knife.

Double Terropterus xiushanensis, the giant swimming beast probably used its limbs to capture prey. The arachnid is the first of its kind to be discovered near the southern region of China and is the oldest known member of the formidable Mixopteridae clan.

Between 443.8 million years ago and 419.2 million years ago, this region was known as Gondwana. The new fossil could deepen our understanding of the diversity and reach of these vicious sea dwellers. Read More

Scientists turn bioplastics into fertilizer

Researchers have found a way to convert certain classes of plastics into fertilizers.

The Tokyo Institute of Technology team has created a new environmentally friendly process. It uses plastics produced from biomass and recycles them into fertilizer.

The team focused on bio-based polycarbonate or PIC which has received a lot of attention as an alternative to petroleum-based polycarbonates. PIC is produced using a non-toxic material derived from glucose called isosorbide (ISB).

To prove that all of the degradation products of PIC can be directly used as fertilizer, the team conducted experiments on plant growth. They found that plants treated with all of the degradation products of PIC grew better than plants treated with urea alone. Read more

Why great white sharks bite humans

Scientists have revealed new information on why great white sharks bite humans. Using a simulated ‘shark vision’ model on the swimming patterns of humans, seals and sea lions, researchers at Macquarie University have shown that humans on surfboards look like baby seals to them. sharks.

Surfers are the group most at risk for fatal shark bites, especially young white sharks, according to the team.

Great white sharks are also referred to as white sharks and along with bull and tiger sharks they account for by far the greatest number of bites on humans.

The team has been working for years to understand how sharks see, exploring the neurosciences of white shark visual systems.

The team compared underwater videos of rectangular floats, seals and sea lions swimming, humans swimming in different swims and humans paddling on surfboards of different sizes in a large aquarium at Taronga Zoo. , with fixed and mobile cameras pointed towards the surface of the water.

Smaller surfboards were harder to distinguish from marine mammals, which is why they are targeted by white sharks. .

Most sharks are probably completely color blind, and the main visual cue for white sharks is silhouette shape, so colors on boards and wetsuits are unlikely to change sharks’ impressions of floating humans. .

However, researchers are now exploring other ways to change the way sharks perceive different silhouettes, including the judicious use of LED lights. Read more

(Edited by Paramita Ghosh)

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