Tough climate roadmap begins

Tough climate roadmap begins

It was undoubtedly one of the most complex and global conferences: the meeting last month in Bali to tackle greenhouse gas emissions lived up to its billing with moments of high drama. Representatives of 190 countries had gathered to map out future plans to tackle global warming, with the US delegation finally agreeing to join in the process at the thirteenth hour (see Hard bargaining, this iss...

Tough times call for tough decisions.

Tough spiders

Spider graphs are the intersection graphs of subtrees of subdivisions of stars. Thus, spider graphs are chordal graphs that form a common superclass of interval and split graphs. Motivated by previous results on the existence of Hamilton cycles in interval, split and chordal graphs, we show that every 3/2-tough spider graph is hamiltonian. The obtained bound is best possible since there are (3/...

Tough Mining

Caenorhabditis elegans, a 1-mm soil-dwelling roundworm with 959 cells, may be the best-understood multicellular organism on the planet. As the most " pared-down'' animal that shares essential features of human biology—from embryogenesis to aging—C. elegans is a favorite subject for studying how genes control these processes. The way these genes work in worms helps scientists understand how dise...

It's Tough...

?for This is a small booklet prepared by the Brother and Sister group of the Association ?-the Help of Retarded Children in New York. It is written to help children who have retarded brother or sister, and summarises such problems as how to accept the situate11' It also gives practical suggestions, such as activities the family can do together. The ide of such a booklet and the points discussed...