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Having a fridge laser could spare you from food poisoning

(credit: Tomaž Štolfa)

While figuring out whether the leftovers in your fridge have gone bad or not, the sniff-test just doesn’t cut it. But unfortunately, there are virtually no consumer-based tests to assure you that your food hasn’t turned, which is a huge public health problem. Each year, around 50 million Americans get food poisoning, and...

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Lunar true polar wander inferred from polar hydrogen

The earliest dynamic and thermal history of the Moon is not well understood. The hydrogen content of deposits near the lunar poles may yield insight into this history, because these deposits (which are probably composed of water ice) survive only if they remain in permanent shadow. If the orientation of the Moon has changed, then the locations of the shadowed regions will also have...

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R-process enrichment from a single event in an ancient dwarf galaxy

Elements heavier than zinc are synthesized through the rapid (r) and slow (s) neutron-capture processes. The main site of production of the r-process elements (such as europium) has been debated for nearly 60 years. Initial studies of trends in chemical abundances in old Milky Way halo stars suggested that these elements are produced continually, in sites such as core-collapse supernovae. But evidence from the...

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