Urban 'microbiome' can offer glimpses into disease trends.
Hungry hippos heft grass from African savannahs to rivers.
In coming decades it may be possible to use brain imaging as legal evidence.
Retroviruses joined the human genome long ago; their effects are not yet clear.
Could life as we know it have developed if fundamental physics constants were different?
Enthusiasts can greatly influence the adoption of new ideas.
The law, technology and self-driving automobiles.
Winners of insects' territorial contests have brighter UV-reflecting wing patches.
Organic farming techniques don't increase milk's nutritional value.
Federal and local law agencies are teaming up to test unanalyzed rape kits.