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Astronomy

The way hungry young stars suck in food keeps most X-rays in, too

The columns of plasma that feed growing stars develop an extra layer that keeps X-rays in.

Animals

Great praise for categories, and seeing beyond them

Acting Editor in Chief Elizabeth Quill discusses classification and some of the challenges of putting species in categorical boxes.

Health & Medicine

Readers intrigued by ancient animals’ bones

Readers had questions about gut bacteria, woolly rhino ribs and ancient horses hooves.

Life

Defining ‘species’ is a fuzzy art

Here's why scientists still don't agree on what a species is.