Today in Tech & Culture, November 1

A market reckoning, a smoother airport, and a small island with a big health milestone: we start November with super intelligence being priced, tested and put to work in the real world.

Alphabet feels the cost of its own answer engine. After third quarter results on October 28, Alphabet shares fell 12.6 percent on Thursday, wiping roughly $500 billion from its market value in a single day, and slipped a further 1.4 percent on Friday as analysts trimmed their targets. Executives acknowledged that growing use of AI Mode, where search returns a conversational answer instead of a list of links, is monetizing more slowly than conventional search, even as total revenue rose 25 percent to $127.6 billion and Google Cloud revenue more than doubled. Why it matters: the company that defined search now has to rebuild its advertising model around the answer itself, and the market wants proof it can be done.

India takes digital airport identity international. From today, Digi Yatra begins three month trials for eligible international travellers at seven Indian airports, including Delhi, Mumbai, Bengaluru and Hyderabad. Travellers holding e-passports and flying with Air India, and on selected IndiGo routes, can use a verifiable digital credential at airport touchpoints instead of repeatedly showing paper documents, extending a domestic system already used by more than 26 million people. Why it matters: travel keeps moving toward one verified identity carried on your phone, and India is now testing it across borders.

Barbados eliminates mother to child HIV transmission. The World Health Organization has recognised Barbados for eliminating mother to child transmission of HIV as a public health problem, after an independent assessment found no new infant infections through this route from 2022 to 2024. Coverage for antenatal care, HIV testing and treatment for pregnant women living with HIV all reached 98 percent, with care provided free of charge. Why it matters: it is proof, at national scale, that a transmission route once considered inevitable can be closed with consistent care.

Oxford finds a way to hold on to sunlight. Researchers at the University of Oxford and international collaborators report in Nature that bismuth sulfide, a familiar semiconductor, can absorb light strongly while sheltering the electrical charges it creates, cutting the relevant charge loss rate by an estimated 75 percent compared with similar absorbers. It is a mechanism, not a finished solar panel. Why it matters: solar progress often stalls on exactly this trade off between absorbing light and keeping its energy, and a material that does both points to a new design route.

Nuremberg puts invention on stage. The International Inventors Exhibition opened in Nuremberg, Germany on October 31, with nearly 600 inventions from participants across more than 20 countries and regions, spanning medical technology, environmental protection and super intelligence. Student projects include a foldable automatic bathing device designed for people with limited mobility, first imagined after its creator volunteered at a nursing home. Why it matters: fairs like this are where practical ideas meet the partners who can turn a prototype into a product people actually use.