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This isotope is found at a ratio of about one per 2,500 helium-4 ions, the latter being the common version of helium.
Interesting Engineering on MSN13h
US high-altitude spy balloons.
The US Army is developing high-altitude spy balloons designed to track enemy stealth fighters beyond the reach of traditional ...
Within 3 decades, we have moved from treating patients with uncoated percutaneous transluminal angioplasty (PTA) to utilizing advanced drug-coated balloons (DCBs ... proving it is still a critical ...