Published on: 2025-06-15 10:51:34
Pacemakers are used to stimulate a regular heartbeat when the body's natural electrical pacing system is irregular or not transmitting properly. Over the years, various power sources have been used for pacemakers, including thermoelectric batteries containing 2 to 4 curies of plutonium-238 (88 year half-life). As the term "thermoelectric" implies, the heat from the decaying plutonium is used to generate the electricity that stimulates the heart. At present (2003), there are between 50 and 100 p
Keywords: approximately pacemaker pacemakers plutonium used
Find related items on AmazonPublished on: 2025-06-26 07:49:40
This has been a long time coming, since the Brazilian Real has seen a 15-20% devaluation against the U.S. dollar in the last couple of years. But today, Apple announced it will be readjusting a few of subscription prices in the country. Up to 34% more expensive As usual, Apple has not commented on its reasoning for the price hikes. But in practice, as noted by iHelpBR, prices increased between 20% and 34% across the board, likely to reflect the current exchange rate and recent local tax increa
Keywords: 70 90 apple approximately plan
Find related items on AmazonPublished on: 2025-08-30 12:35:32
This article has been reviewed according to Science X's editorial process and policies . Editors have highlighted the following attributes while ensuring the content's credibility: Per-capita income and inequality in the Roman and Han Empires. Credit: Nature Communications (2025). DOI: 10.1038/s41467-025-58581-0 A trio of researchers from Bocconi University, in Italy, the University of Cambridge, in the U.K., and Stanford University, in the U.S., has found that there was more economic inequali
Keywords: approximately empire han researchers roman
Find related items on AmazonPublished on: 2025-08-31 08:02:15
Grappling with infinity in constraint solvers Published November 17, 2019 by Chris Patuzzo In 2016, I created a programming language called Sentient. Since then, I’ve had time to reflect and think about the language. This series is about that. Many constraint-satisfaction problems deal with infinity in some shape or form. Even rudimentary problems, like "Find two integers that sum to 10". Solutions include: (4, 6) (-7, 17) (-1953856112, 1953856122) That (d)escalated quickly! In fact, the
Keywords: approximations integers program sentient space
Find related items on AmazonPublished on: 2025-09-10 17:07:48
A Multiwavelength Look at Proxima Centauri’s Flares The problem of flares in red dwarf planetary systems is stark. With their habitable zones relatively near to the star, planets that might support life are exposed to huge outbursts of particles and radiation that can strip their atmospheres. We can see that in nearby M-dwarfs like Proxima Centauri, which is extremely active not only in visible light but also in radio and millimeter wavelengths. New work at the Atacama Large Millimeter/submilli
Keywords: centauri flares millimeter optical proxima
Find related items on AmazonPublished on: 2025-11-21 18:52:46
Proxima Fusion, a two-year-old, German nuclear fusion startup, has published plans for a working fusion power plant in a peer-reviewed journal, in what is being touted as a step-change in the race to generate limitless energy. Today’s nuclear fission reactors create radioactive waste, whereas nuclear fusion releases vast amounts of energy, with zero carbon emissions and only minimal radiation. So-called tokamaks and stellarators are types of fusion reactors that use electromagnets to contain f
Keywords: design energy fusion nuclear proxima
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