Scientists scrutinize new video of orcas hunting great white sharks

Back in July, we heard how orcas were hunting great white sharks in South Africa. While scientists were basing their findings on examinations of shark carcasses, they've now gained new insights by analyzing aerial video of a hunt in action.

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Oldest known heart found preserved in 380-million-year-old fish fossil

Soft tissues don’t fossilize well, so scientists have to infer organ anatomy from bones. But an unexpected treasure trove of new information has been discovered in Australia, with a 380-million-year-old fish fossil preserving the oldest heart ever found.

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Oldest known heart found preserved in 380-million-year-old fish fossil

Soft tissues don’t fossilize well, so scientists have to infer organ anatomy from bones. But an unexpected treasure trove of new information has been discovered in Australia, with a 380-million-year-old fish fossil preserving the oldest heart ever found.

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Basking sharks found to choose mates by swimming in giant circles

Even though the basking shark is the world's second-largest fish, much of its life has eluded observation. Now, however, researchers have determined that the usually solitary animals find mates by meeting up and circling around one another.

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“Brain thermometer” circuitry might explain those summer afternoon naps

A new study on fruit flies may help explain why siestas came to be such an important habit in many cultures, revealing a type of brain thermometer that kicks sleep-promoting cells into action as the mercury starts to climb.

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Study suggests “networking” bats work together to find food faster

When we think of animals that work together to hunt prey, we typically think of creatures such as wolves or orcas. Common bats may soon be added to that list, as a new study suggests that they show each other where the tasty insects can be found.

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Synthetic embryos grown from stem cells don’t need sperm or eggs

Researchers have created some of the most advanced synthetic mouse embryos out of stem cells, removing the need for sperm, eggs and even a womb. The technology could help us understand development and eventually be used to grow organs for transplant.

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Newly discovered chemical reactions could explain the origin of life

Exactly how non-living molecules sparked life is one of the most puzzling mysteries of science. Scientists have now discovered chemical reactions that can produce the building blocks of life out of materials common in early Earth's primordial soup.

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Fungus fools male houseflies into mating with corpses of dead females

In truly creep news, a team of scientists has announced that a known fungus causes male flies to mate with the bodies of dead females. The strategy helps ensure the survival of the fungus, as it spreads from the females to the males.

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Were dinosaurs warm- or cold-blooded? Clues lie in their breath and bones

Dinosaurs sit at the crossroads between reptiles and birds, leading scientists to debate whether they were warm- or cold-blooded. A new study may have the answer for different dinosaurs by analyzing metabolic markers from their breath in their bones.

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