MACROSCOPE
Strategy Versus Evolution
Reaching President Obama's CO2 emissions goal for 2050 will require strategic planning
Alex Pavlak
COMPUTING SCIENCE
Recreational Computing
Puzzles and tricks from Martin Gardner inspire math and science
Erik D. Demaine
ENGINEERING
Rereading Vitruvius*
The best of books stand the test of time—both physically and intellectually
Henry Petroski
MARGINALIA
The Cutting Edge
Can stone-tool marks on fossils be distinguished from tooth marks?
Pat Shipman
SIGHTINGS
Zooming In on Mars
A new map available online shows more of the red planet in greater detail than ever
Catherine Clabby