As New York City decides about the World Trade Center site, we discuss the significance of a city skyline.

Suspect arrested, may be charged with trying to develop a dirty bomb. What is a dirty bomb, and how badly would it harm us?

A Beautiful Mind raises the issue: How are mathematicians and scientists portrayed in movies and film? We dig white coats on silver screens.

Airbus crashes in New York — composite material fails and tail fin falls off. Why are composites (usually) so strong? How are they used in roads, bikes and planes?

Harry Potters’ guide to science of amphibians, witches and asthma.

Will terrorists use biological weapons? How have bio-weapons been used in the past?

Treating cow manure with carbonate reduces threat from dangerous E. coli bacteria. Should this treatment be used more widely?

Before some building projects, salvage archaeologists save what they can. What can you learn with a quick-and-dirty dig? Is it worth the hassle?

African science produces cancer drug, dust, rain and desertification and linguist Joseph Greenberg.

How do crime labs do fingerprint identification, DNA fingerprinting, and gun-barrel identification?