Cannabis composition determines effects on the brain.
Letters to the editor about the May/June 2010 issue of Scientific American MIND
Groups of two to five members who interacted with each other best outperformed groups whose individual members had higher intelligence scores. Karen Hopkin reports
A new book explores the many ways in which common chemicals--and other outside influences--encountered in the womb can impact lifelong development
A new type of supernova is forcing astronomers to rethink the lives of the biggest stars
Do graphic warning labels on cigarette packages really deter people from lighting up?
We like hues that we associate with pleasant things
Research confirms that women tend to apologize much more frequently than men do, but there's a curious twist as to why this is the case. Christie Nicholson reports
Psychedelics are back! As readers of Scientific American know, scientists have recently reported that psychedelics show promise for treating disorders such as depression, post-traumatic stress disorder, and anxiety in terminal cancer patients...
Subjects varied their estimates of the calorie content of a food depending on the assumed negative or positive healthful qualities of the food item they had previously been shown--with weird consequences...
Gestures reveal subconscious knowledge and cement new ideas
Our Web survey of readers suggests that the scientifically literate public still trusts its experts—with some important caveats
A new study shows that the overheard half of cell phone dialogue can steal our attention from other tasks, with potentially dangerous outcomes
Editor in Chief Mariette DiChristina introduces the October 2010 issue of Scientific American
New case studies focus on rare illusory body perceptions that could answer questions about how we maintain a "self"
Buying eco-friendly products might make you more likely to behave badly later on
We only consider scientists to be experts when their argument is in line with our own previously held beliefs. Christie Nicholson reports