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Some early investors were allowed to sell, driving the stock price to historic lows.

What could be worse than a ruptured pipeline of crude oil? A ruptured pipeline of tar sands oil — a thick, sticky substance. Cleanup of a 2010 spill in Michigan's Kalamazoo River took much longer and was far harder than anyone had anticipated. It's now a cautionary tale for people in the middle of the new Keystone pipeline's path.

The online marketplace said the sale of those items often results in "difficult to resolve" issues.

Mitt Romney told reporters Thursday that he has never paid less than a 13 percent tax rate over the past decade. Until now, the presumptive Republican nominee had sidestepped questions about his personal income taxes. Romney has come under withering criticism over the tax issue from President Obama's campaign and Senate Majority Leader Harry Reid.

The shooting followed an attempt by police to disperse striking workers at Marikana, the world's third-largest platinum mine, about 40 miles northwest of Johannesburg. It's one of the deadliest incidents of violence in the country since the end of apartheid.

A new study suggests using the term psychopath adds an average of five years to criminal sentences. But once a biological explanation was included, the length of the sentence dropped. In other words, our sympathy for the idea that biology might be responsible for criminal behavior is powerful.

By tricking live fish into attacking computer-generated "prey," scientists have learned that animals like birds and fish may indeed have evolved to swarm together to protect themselves from the threat of predators.

Refinancing is not available to everyone. But those who can refinance switch from adjustable- to fixed-rate mortgages, locking money in at rates their parents in the 1980s never dreamed of. Many shave a couple of hundred dollars off their monthly mortgage payment; some get an even bigger windfall.

The mayor of a Belgian seaside resort town wants to sue a private meteorological service for issuing a pessimistic full-summer forecast that has resulted in cancellations and loss of revenue. A similar complaint against Dutch meteorologists has been lodged in neighboring Netherlands.

South African Police officers killed more than 30 striking workers during a confrontation at a mine owned by Lonmin PLC Thursday. The shooting has been called one of the worst in the country since the end of the apartheid era.