Belief in Evolution Boils Down to a Gut Feeling
Intuitive reasoning may help explain why some people are more accepting of evolution than others.
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Not By Asteroid Alone: Rethinking the Cretaceous Mass Extinction
At the end of the Cretaceous period some 65 million years ago, an asteroid slammed into Mexico’s Yucatan Peninsula, causing severe but selective extinction. While that is widely accepted, it has remained unclear exactly what the mechanisms were that caused extinction of ocean-dwelling organisms. Proposed explanations include global darkness due to blocking of sunlight with…
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Education, Religion … Evolution?
The evidence is clear, as in a February 2009 Gallup Poll, taken on the eve of the 200th anniversary of Charles Darwin’s birthday, that reported only 39 percent of Americans say they “believe in the theory of evolution,” while a quarter say they do not believe in the theory, and another 36 percent don’t have…
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Multicellular Life Evolves in Laboratory
An evolutionary transition that took several billion years to occur in nature has happened in a laboratory, and it needed just 60 days. Under artificial pressure to become larger, single-celled yeast became multicellular creatures. That crucial step is responsible for life’s progression beyond algae and bacteria, and while the latest work doesn’t duplicate prehistoric transitions,…
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Volunteers Wanted for Planet Hunt
Members of the public are being asked to join the hunt for nearby planets that could support life.Volunteers can go to the Planethunters website to see time-lapsed images of 150,000 stars, taken by the Kepler space telescope. They will be advised on the signs that indicate the presence of a planet and how to alert…
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More Earth-like Planets Discovered by NASA
It’s another batch of newly discovered earth-like planets, according to NASA officials. U.S. space agency officials announced they have discovered another series of planets, the latest such planets to hit the space agency radar. The space agency said the latest discover reveals some of the smallest earth-like planets yet discovered. Space agency officials said the…
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The First Oxygen Users?
None of us would be here today if, billions of years ago, a tiny, single-celled organism hadn’t started using oxygen to make a living. Researchers don’t know exactly when this happened, or why, but a team of scientists has come closer than ever before to finding out. They’ve identified the earliest known example of aerobic…
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Can A Scientist Define “Life”?
Defining life poses a challenge that’s downright philosophical. There’s no ambiguity in looking for water, because we have a clear definition of it. That definition is the same whether you’re on Earth, on Mars, or in intergalactic space. It is the same whether you’re dealing with water as ice, liquid, or vapor. But there is…
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Before DNA, Before RNA: Life in the Hodge-Podge World
Because RNA can do many things at once, those studying the origins of life have long thought that it was the first genetic material. But the discovery that a chemical relative called TNA can perform one of RNA’s defining functions calls this into question. Instead, the very first forms of life may have used a…
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The Big Debate Over the Oldest Life on Earth
Oxford paleontologist Martin Brasier asserts that his fossilized cells are the remains of primitive anaerobic bacteria that lived 3.4 billion years ago. Paleobiologist J.W. “Bill” Schopf’s samples, he believes, are just ancient, patterned rock, with no fossils at all. Settling the debate matters a great deal. At its heart is one of the biggest questions…