Combining the secrets that enable water striders to walk on water and give wood its lightness and great strength has yielded an amazing new material so buoyant that, in everyday terms, a boat made from 1 pound of the substance could carry five kitchen refrigerators, about 1,000 pounds.

One of the lightest solid substances in the world, which is also sustainable, it was among the topics of a symposium in San Diego March 25 at the 243rd National Meeting & Exposition of the American Chemical Society, the world's largest scientific society. The symposium focused on an emerging field called biomimetics, in which scientists literally take inspiration from Mother Nature, probing and adapting biological systems in plants and animals for use in medicine, industry and other fields.

Olli Ikkala, Ph.D., describedFrom 1501, when the first slaves arrived in Hispaniola, until the nineteenth century, some twelve million people were abducted from west Africa and shipped across thousands of miles of ocean – the infamous Middle Passage – to work in the colonies of the New World. Perhaps two million Africans died at sea. Why was slavery so widely condoned, during most of this period, by leading lawyers, religious leaders, politicians and philosophers? How was it that the educated classes of the western world were prepared for so long to accept and promote an institution that would later ages be condemned as barbaric? Exploring these and other questions – and the slave experience on the sugar, rice, coffee and cotton plantations – Kenneth Morgan discusses the rise of a distinctively