A roundup of weekly science policy and related news.

Drought and dams allow saltwater to invade, threatening people and the ancient marshes of Mesopotamia.

A dash of the metal could hold the key to making cheap, durable perovskite photovoltaics.

Renovated building aims to foster alliances.

Report to Congress finds a gender disparity in grant awards-and a dearth of data.

Drug companies are racing to prove antibody treatments can prevent the debilitating headaches.

An ambitious history of the SSC falls short on lessons for future megascience projects

Looking back at our ever-evolving understanding of what it means to be alive

As of 1 January 2016, Science will no longer provide a weekly list of books received.

Basin-scale planning is needed to minimize impacts in mega-diverse rivers

Highly biodiverse tropical grasslands are at risk from forest-planting efforts

Laboratory measurements provide a window into Earth's mantle dynamics [Also see Report by Girard et al.]

The favorable thermoelectric properties of SnSe are related to its crystal symmetry [Also see Report by Zhao et al.]

Toxicity arises from amyloid-like protein accumulation in the cytoplasm, not the nucleus [Also see Report by Woerner et al.]

Adult bone marrow employs a surprisingly simple hematopoietic hierarchy [Also see Research Article by Notta et al. and Report by Khan et al.]

Inhibitory inputs from the lateral entorhinal cortex help to make contextual memory associations specific.

As humans age, progenitor cells take over from stem cells the task of producing a steady supply of blood cells. [Also see Perspective by Cabezas-Wallscheid and Trumpp]

Satellite imaging isolated hazard potential for earthquake-triggered landslides after the 2015 Gorkha earthquake in Nepal.

A thermoelectric derived by sodium doping of tin selenide has a high power factor and conversion efficiency over a wide temperature range. [Also see Perspective by Behnia]

Shearing experiments at lower mantle conditions show that the less abundant of the two major mantle minerals is easily deformed. [Also see Perspective by Chen]

Sediment records are used to identify catastrophic debris flows from paleoquakes near Pokhara, Nepal.

Addition of cesium cations creates a robust ideal inorganic-organic perovskite absorber for tandem silicon solar cells.

The consistency of tropical tree size structure is related to the frequency of small-scale disturbance and competition for light.

As a corpse rots, the microbial succession follows a similar pattern across different types of soil.

Mummified remains from the Alps reveal an unexpected history for a human pathogen.

Groundwater effects misled us about the Devils Hole climate record for nearly three decades.

Daughter cells get their fair share of mitochondria.

Protein aggregates in the cytoplasm soak up accessory factors needed for transport of other proteins and RNA across the nuclear envelope. [Also see Perspective by Da Cruz and Cleveland]

A blood vessel-associated microenvironment supports the expansion of hematopoietic stem cells in the fetal liver. [Also see Perspective by Cabezas-Wallscheid and Trumpp]

A complex in the outer membrane of Gram-negative bacteria inserts other outer membrane proteins sideways.

For dendritic cells to find their way to lymph nodes, the chemokine receptor CCR7 needs to have polysialic acid on it.

On this week's show: Mitigating migraines, clocking corpse decomposition, and a news roundup.

A weekly roundup of information on newly offered instrumentation, apparatus, and laboratory materials of potential interest to researchers.