Metal–organic frameworks (MOFs) are a revolutionary new class of crystalline solids that can be designed to trap myriad kinds of matter, including greenhouse gases, or to be used as nanosized drug carriers. They can also pull water from desert air.
Twenty years ago, two chunks of rock plummeted from space. One landed in Texas in March, only yards away from a children’s basketball game. The other hit the ground in Morocco five months later. At the time, no one guessed that the meteorites carried some very unique passengers: crystals embedded with clues to the origins of life on Earth.
Two factors that contributed to the poisoning of tens of thousands of Washington, D.C., residents through their drinking water in the early 2000s—lead pipes and a disinfectant called chloramine—continue to coexist in countless water systems nationwide, including in the Bay Area. But not to worry, says UC Berkeley water expert and engineering professor David Sedlak; they’re safe when properly managed, which happens in the vast majority of public water systems.
Nairobi is a tough town, and there’s no place in Nairobi that’s tougher than Kibera, Africa’s largest slum. Maybe a half-million people live there, maybe a million. No one’s really counting. But virtually everyone is desperately poor, with per capita earnings averaging about a dollar a day. Rape, assault, and murder are simple facts of daily life. The streets are paved with rotting garbage, sewage flows in the gutters, disease is rampant, and city services are largely nonexistent.
The drought may not have caused California’s water crisis, but it’s certainly brought it to the attention of a public largely uninterested in it until government fiat made shorter showers and dead lawns de rigueur. State water demand has outstripped supply for decades. Water rights claims for the massive State Water Project and federal Central Valley Project outpace average annual supplies by at least five fold.
Posted on March 1, 2016 - 10:49am