The California High-Speed Rail Authority's forecasts of demand and ridership for a new San Francisco-to-Los Angeles high-speed train are not reliable because they are based on an inconsistent model, according to a new study by researchers at UC Berkeley's Institute of Transportation Studies. The study is the first academic review of the rail authority's ridership forecasts, which was included in California's successful application for federal stimulus dollars.

The world of elementary particles is divided between bosons, such as photons, and fermions, including electrons and neutrinos. Fermions and bosons play by separate rules, which makes chemistry possible as well as superconductivity. But do bosons sometimes play by fermion rules? Two UC Berkeley physicists asked that question, and found — so far — that the answer is, no.

Six Berkeley faculty members experts were selected by the Intergovernmental Panel on Climate Change (IPCC) to write the fifth comprehensive climate-change report.

A new UC Berkeley-led study of pregnant women links higher blood levels of PBDEs, a common type of flame retardant, with altered thyroid hormone levels. Normal maternal thyroid levels are important for healthy fetal neurodevelopment.

Of all of the advances people have developed over the millennia, food plants may be the most important. By examining the plant remains on early settlements, Berkeley professor of anthropology Christine Hastorf pieces together how ancient peoples worked, ate, traded and worshiped.

The UC Botanical Garden at Berkeley, nestled in Strawberry Canyon just above the central campus, features a mind-boggling 12,000 kinds of plants and breathtaking views of the Bay Area. The term breathtaking soon will describe the rotten flesh-like stench of the garden’s about-to-blossom Titan Arum, aka the corpse plant

Vegetation around the world is on the move, and climate change is the culprit, according to a new analysis of global vegetation shifts led by a UC Berkeley ecologist in collaboration with researchers from the U.S. Department of Agriculture Forest Service.

Chemical biologist Carolyn Bertozzi will receive this year's $500,000 Lemelson-MIT Prize, which honors inventors and entrepreneurs. Bertozzi, a professor of chemistry, has developed innovative chemical reactions that can be performed on biological molecules, living cells and even in live animals without harming them.

Using a new statistical method to compare the genes of 50 specimens of the West African forest gecko, two former UC Berkeley students have determined that the widely distributed species is actually four distinct species that appear to have evolved over the past 100,000 years as the rain forest fragmented with increasing aridification.

In a 20-year quest to determine why Listeria bacteria produce a uniquely strong immune response in humans, UC Berkeley scientists have found part of the answer: an unsuspected signaling molecule that the bacteria pump out and which ramps up production of interferon by the host. Interferon mobilizes the immune system to fight off bacteria and viruses.