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Low-frequency mechanical energy harvesting could provide as much as 40 percent of the power requirements for next generation smartphones and tablets.
Covid-19: Chinatowns fighting racism and pandemic to survive By Sophie Williams image captionSan Francisco's Chinatown, pictured in May 2020, has been hit hard by the pandemic Lunar New Year is usually the busiest period for businesses in Chinatowns around the globe. But in 2020, it coincided with the outbreak of the coronavirus pandemic, leaving many restaurants empty. A year on, the BBC speaks to business owners to find out how they survived - and what's next. Sam Wo's has been a fixture in San Francisco's Chinatown for more than a century, but the last year has been hard. Coronavirus has ...