Also up there is the fallout from a global economic collapse, possibly resulting from a state of peak oil -- the point where oil production reaches its peak and thereafter goes into freefall.

CNN: Survivalists get ready for meltdown

Optimized for customers in oil and gas exploration and the defense industry, a single Tesla K10 accelerator board features two GK104 Kepler GPUs that deliver an aggregate performance of 4.58 teraflops of peak single-precision floating point and 320 GB per second memory bandwidth.

ENGADGET: NVIDIA outs a pair of Tesla GPUs to electrify your supercomputer

This ratio is just one percentage point away from an annual pessimistic peak point to extreme skepticism among short-term options players.

FORBES: Magazine Article

Even the most bearish analysts say Nasdaq could pull back only up to 30% from its Jan. 3 peak, and the Dow could test the 9, 000-point level, down about 20%.

CNN: Millennium Meltdown

It's over three billion units at this point and at its peak, it was on two-thirds of the world's cellphones.

ENGADGET: Thomas Dolby's Wild Ride

Over the last two years, as prices have soared, proponents of the Peak Oil theory--which argues that we will soon pass the point of being able to replace reserves as fast as they are consumed--have resurfaced in force.

FORBES: Really, Really Cheap Oil

During the last decade, the Finnish cell-phone giant reached the peak of its success, producing at one point more than 40% of all the handsets sold around the globe.

FORBES: Don't Count Nokia Out Yet

Yields on American ten-year Treasuries jumped more than half a percentage point to 3.5%, a six-month peak.

ECONOMIST: Get ready for more volatility in government bonds

Recommended hikes include the two-night, three-day climb up Mwanihana Peak (2, 080m) and the challenging six-day trail to Luhombero Peak (2, 579m), the highest point in the park.

BBC: Hiking in Tanzania

Pessimists point to 1931-35, when dividends per share in America fell by 45% from peak to trough.

ECONOMIST: Stockmarkets and dividends