Stories by Marissa Fessenden

The microbe that is known to cause cat scratch fever remains cloaked in mystery

A new exhibit displays previously unpublished images from the father of fractals

10 innovations that are radical enough to alter our lives

Milk composition differs based on a baby's sex and a mother's wealth

In a noteworthy example of convergent evolution, Katydid ears have evolved components resembling those of humans, albeit on a much smaller scale

Scientific American asks leaders of a dozen House and Senate committees for written answers to eight policy questions related to science and technology

A biologist on lusty birds and human evolution

Researchers have observed in an experiment the exact steps bacterial genes take to evolve a new ability, unexpectedly adding a new twist on an old model

Contaminated medication has put thousands at risk for a rare form of meningitis—and the outbreak may last longer than first thought. An infectious disease expert explains what fungal meningitis is and the possible course the unfolding illness may take

Observing signaling molecules before they leave a cell could give researchers insights into how cells in our bodies influence one another

A major study moves food-allergy treatments a step closer to reality

Data from NASA's Dawn spacecraft reveals easily evaporated chemicals and hydrogen on the asteroid, suggesting the presence of water mixed into its surface material

Concert hall designers generally aim for acoustics that satisfy experts, but a move is afoot to also consider the tastes of other concertgoers

An astronomer describes his search for meteor showers and hopes others will join in the fun