In this issue:

"Why Tesla Is Worth More than GM" by James Surowiecki.

"Help from Above" by Jonathan W. Rosen.

"Carbon" by Katherine Bourzac.

"Oxford Nanopore" by Antonio Regalado.

"IBM" by David H. Freedman.

"General Electric" by Elizabeth Woyke.

"Why Bad Things Happen to Clean-Energy Startups" by James Temple.