But several other chip-making techniques will need to be modified if his radical new approach is to succeed.

ECONOMIST: Semiconductors

Making progress on agriculture, particularly on the barriers to genetically modified crops and hormone-treated meat produced by American farmers, will be tough, but is politically important to secure support for the deal in Congress.

WSJ: Bartering Over a Trans-Atlantic Trade Deal

The pope will be making his way around parts of Washington in the popemobile, a Mercedes Benz modified with bulletproof glass surrounding a seating area from which the pope can wave to bystanders along his route.

CNN: Pope Benedict XVI begins first U.S. tour

But a modified approach that does not involve viruses is likely to be the ultimate way of making human stem cells.

ECONOMIST: Human embryonic stem cells