Pocketknives will be allowed if the blade is no longer than 2.36 inches (6 centimeters), which is shorter than the 4-inch blades that were allowed at the time of the 2001 attacks.

CNN: March 7, 2013 -- Updated 0312 GMT (1112 HKT)

Pistorius, who runs on L-shaped carbon blades, finished second in his heat with a time of 45.44 seconds.

WSJ: Menu

With every tick, they are tossing blades of grass into the wind to gauge direction in real-time.

FORBES: Hypselotimophobia: The Fear Of High Prices

Until the development of the Charlestown Test Center, any company moving into development of longer blades had to test in Europe, which was time-consuming and costly.

FORBES: Connect

It was the first time Pistorius had put his blades on since he shot dead Steenkamp in his home in the early hours of Feb. 14, his agent, Peet van Zyl, told the AP later on Thursday.

NPR: Newspaper Publishes Photo Of Pistorius In Blades