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Positron emission tomography uses radioactive tracers and gamma-ray detection to map metabolic activity inside the body, making it a vital tool for diagnosing cancer, heart disease, and brain disorders.
Technology
Naval mines are among the cheapest weapons to deploy yet the most expensive and dangerous to remove. Here is how navies detect, sweep, and neutralize...
Science
The Haber-Bosch process turns atmospheric nitrogen into ammonia for fertilizer, sustaining nearly half the global population — but its massive carbon...
Science
Your cells produce three toxic gases—nitric oxide, carbon monoxide, and hydrogen sulfide—that double as vital signaling molecules regulating blood pre...
Science
Sungrazing comets plunge within thousands of kilometers of the Sun's surface, enduring extreme heat and tidal forces. Most disintegrate, but their des...
Economy
For nearly three decades, countries agreed not to tax digital goods crossing borders. With the WTO e-commerce moratorium now expired, the door is open...
Health
HPV self-collection lets people screen for cervical cancer at home using a simple swab. Here's how the technology works, who it helps, and why experts...
Health
Millions now use AI chatbots for emotional support and mental health advice. Experts explain how these tools work, what research shows about their ben...
Culture
Peru has cycled through nine presidents since 2016, more than any other democracy. A vague constitutional clause, extreme party fragmentation, and end...
Science
Piezoelectric materials generate electricity when squeezed and change shape when electrified. From quartz watches to medical ultrasound and next-gener...
Economy
Illiberal democracy describes a system where free elections coexist with eroded civil liberties, weakened courts, and controlled media. Here is how it...
Science
Carotenoids are plant pigments that do far more than add color to fruits and vegetables—they shield your eyes from damage, strengthen your immune syst...
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