Scientific American Magazine

Single women with young children constitute the most rapidly growing segment of homeless persons. Emergency shelter can only partly ease the physical and psychological devastation experienced by these families

By applying quantum mechanics to the universe as a whole, cosmologists hope to look beyond the very instant of creation

This master cell creates the key components of the human blood cell and immune systems. Isolating and manipulating the stem cell will lead to new treatments for cancer, immune defects and other disorders

Analysis of horse teeth from the Ukraine proves that riding began 6, 000 years ago, much earlier than had been supposed. The innovation affected the dispersion of culture and language

The production of chemical fuels from sunlight offers a form of energy that can be transported and stored, overcoming the limitations of converting solar energy directly to electricity

This Australian bird is one of a family that constructs mounds in which to incubate its eggs. The process requires remarkable adaptations of both egg and hatchling

An extraordinary mathematician, she struggled against the prejudices of 19th-century French society to produce enduring work in number theory and the theory of elasticity

Researchers are trying to build machines that emulate the reasoning and self-awareness of humans, but in the real world even the competence of a mayfly eludes them-for now.