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Conceptual illustration of a stopwatch surrounded by other elements like waves and atoms.
Physical World

Watching the world, one quintillionth of a second at a time

An attosecond is no time at all for a person. Not so for electrons, atoms and molecules. Laser-wielding scientists are revealing the action.

A conceptual illustration consisting of many squiggly threads, some larger than others, and in various colors: blue, orange and red. A darker semicircle in the middle is meant to depict the cell’s nucleus.
Living World

The blueprint for life, neatly folded

Bit by bit, biologists are deciphering the complex 3-D — and 4-D — architecture of the genome and learning how all the squeezed-together stuff of DNA keeps itself in order. What they find could lead to medical advances.

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