Cells intuitively avoided dead-ends when released into microscopic mazes. Here’s how. FOR A SINGLE CELL, the human body is a gargantuan maze of tissues, chemicals and capillaries, crammed full with trillions of other cells all bustling about like commuters at the world’s…

SCIENTISTS HAVE DISCOVERED what they say could be fossils of some of the earliest living organisms on Earth. They are represented by tiny filaments, knobs and tubes in Canadian rocks dated to be up to 4.28 billion years old. That is a time not long after the planet’s formation and hundreds of millions…