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Fastest flash mental arithmetic

Takeo Sasano (Japan) correctly added 15 sets of three-digit numbers flashed on the screen in 1.83 seconds at All Japan Soroban Championships in Yasu-shi, Shiga-ken, Japan, on 8 August 2010. The time begins when the first three-digit number is flashed on the screen and ends when the last number is flashed. The skill is in memorising these numbers then adding them. The competitor has then 5 seconds to write the answer. At Mr Sasano’s attempt, 15 numbers were flashed up in just 1.83 seconds – Continue reading →

Fastest flight across the Atlantic

The flight record is 1 hr 54 mins 56.4 secs by USAF Major James V. Sullivan, and Major Noel F. Widdifield, flying a Lockheed SR-71A Blackbird eastwards on 1 September 1974. The average speed for the New York–London stage of 5,570.80 km (3,461.53 miles) was 2,908.02 km/h (1,806.96 mph). The speed only slowed to refuel once from a specially-modified KC-135 refuelling tanker aircraft. The aircraft then went on display at Farnborough Air Show for one week – the first time the secret plane had been Continue reading →