Stars live for a long time - millions of years - but near the end of their lives, some massive stars go through what astronomers call the yellow supergiant phase.
Because the timeframe is so short, cosmically, witnessing a yellow supergiant phase is rare - almost as rare as a Kardashian staying married when ratings slip. Like with celebrity relationships, if you want to witness the big meltdown you have to stay vigilant in astronomy. And keep your camera running.
The iconic Coelacanth are fish well-known as ‘living fossils’. Coelacanths were thought to have died out with the dinosaurs and then a living one was caught off the coast of South Africa in 1938, sending waves of excitement throughout the scientific world.
Clinical studies, the central means by which preventive, diagnostic, and therapeutic strategies are evaluated, that were registered between 2007-2010 were dominated by small, single-center trials and contained significant heterogeneity (different in nature, difficult to compare) in methodological approaches, including the use of randomization, blinding, and data monitoring committees, according to an analysis in JAMA.
Giant flea-like animals, possibly the oldest of their type ever discovered, bit creatures much larger than they are 165 million years ago - and lived to talk about it.
These flea-like animals, were similar to modern fleas but 10 times the size of a flea you might find crawling on your family dog – with a proboscis and an extra-painful bite to match. Dinosaurs were likely not amused.
A new imaging study shows the brains of embryonic chicks can 'wake' long before chicks are ready to hatch out of their eggs - but it took loud, meaningful sounds. Playing meaningless sounds wasn't enough to rouse their brains.
As modern medicine continues to push back the gestational age at which prematurely born infants can reliably survive, pediatricians have worried about the effects of stimulating brains that are still 'under construction'. It turns out that,like adult brains, embryo brains also have neural circuitry that monitors the environment to selectively wake the brain up during important events.
Our solar system is believed to be around 4.5 billion years old, but it's difficult to know how long it actually took to form.
The reason is, basically, our 'clocks'.
Establishing chronologies of past events or determining ages of objects require having clocks that 'tick' at different paces - nuclear clocks used for dating are based on the rate of decay of an atomic nucleus expressed by a half-life, which is the time it takes for half of a number of nuclei to decay, a property of each nuclear species. Radiocarbon dating is the most famous. It was invented in Chicago in the late 1940s and can date artifacts back to prehistoric times because the half-life of radiocarbon (carbon-14) is a few thousand years.
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