Investors fled to ultra-safe Treasuries in response to the euro-zone debt crisis.

FORBES: Elliott Wave Analysis Of The 10-Year US Treasury Note

By contrast, the Social Democrats and the Greens are making gains even though they want Eurobonds that could merge ultra-safe German debt with Greek junk.

ECONOMIST: Charlemagne

Yet Brian Coulton of Fitch, a rating agency, points out that this reflects falling German yields (as investors seek ultra-safe havens) rather than rising Italian ones.

ECONOMIST: Fretful markets fear the worst

Radiation is a threat to human health at every stage of the process, from uranium mining to plant operation (even in those new ultra-safe plants) to waste disposal.

ECONOMIST: A renaissance that may not come

Shorter-term Treasuries were mixed, as the yield on the ultra-safe three-month bill fell slightly, to 0.10%, from 0.11%, while the yield on the two-year note was flat at 0.78%.

FORBES: Magazine Article

It seems like he is not the only person who believes thorium, a naturally-occurring, slightly radioactive metal discovered in 1828 by the Swedish chemist Jons Jakob Berzelius, could provide the world with an ultra-safe, ultra-cheap source of nuclear power.

FORBES: Is Thorium the Biggest Energy Breakthrough Since Fire? Possibly.

And if the crew assigned to man the deep-space mission travels up separately to the station, it would also mean all the elements for their long-duration flight could be launched without the complications of ultra-safe abort systems that complicate manned rockets.

BBC: Manned flight around Moon considered