Extrasolar systems shed light on our own

Making Our Own Luck

QuickCheck-style property-based random testing [4] requires efficient generators for well-distributed random data satisfying complex logical predicates. Writing such generators by hand can be difficult and error prone. We propose a domain-specific language, Luck, in which generators are expressed by decorating predicates with lightweight annotations controlling both the distribution of generate...

Quantum dots shed light on diagnoses.

Featured article: Kim S, Lim YT, Soltesz EG, De Grand AM, Lee J, Nakayama A, Parker JA, Mihaljevic T, Laurence RG, Dor DM, Cohn LH, Bawendi MG, Frangioni JV. Near-infrared fluorescent type II quantum dots for sentinel lymph node mapping. Nat Biotechnol 2004;22:93–7. Near-infrared (NIR) (700 –2500 nm) in vivo imaging with semiconductor quantum dots (QDs) can offer nonradioactive extraction of me...

Genotype networks shed light on evolutionary constraints.

An evolutionary constraint is a bias or limitation in phenotypic variation that a biological system produces. One can distinguish physicochemical, selective, genetic and developmental causes of such constraints. Here, I discuss these causes in three classes of system that bring forth many phenotypic traits and evolutionary innovations: regulatory circuits, macromolecules and metabolic networks....

Studies shed light on sunscreen efficacy.

Ancestor to Call Our Own

Controversial new fossils could bring scientists closer than ever to the origin of humanity POITIERS, FRANCE—Michel Brunet removes the cracked, brown skull from its padlocked, foam-lined metal carrying case and carefully places it on the desk in front of me. It is about the size of a coconut, with a slight snout and a thick brow visoring its stony sockets. To my inexpert eye, the face is at onc...