There is a huge amount of plastic waste polluting our oceans – but we don’t know where it is. Marric Stephens investigates what scientists are doing to find the missing plastic
The first measurements from a newly built gamma-ray observatory have been analyzed for signs of the decay of heavy dark matter, putting a lower limit on the hypothetical particles' lifetime.
By Marric Stephens
Atomic magnetometers employing two new geometries can exclude background fields to pick up weak, nearby radio-frequency sources.
By Marric StephensF rom the slivers of natural magnetite used as the earliest magnetic compasses to today's cryogenically cooled superconducting quantum interference devices, researchers have employed many diverse means to measure magnetic fields. Now Robert Cooper at George Mason University, Virginia, and colleagues have added two more [1]. Their instruments, which are variations on a high-precision instrument called an optically pumped atomic magnetometer, are the first demonstrations of "intrinsic radio-frequency gradiometers." These devices are especially suited to measure weak, local radio-frequency sources while excluding background fields.
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