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A quadcopter about two feet in diameter was found on the lawn inside the White House fence on Monday morning, the Secret Service has reported. In a 3 a.m. news briefing, the Secret Service said "an investigation is underway to determine the origin of this commercially available device, motive, and to identify suspects." The drone did not appear to be a threat to anyone inside, White House spokesman Josh Earnest said. President Obama was in India at the time of the incident.
A hybrid power aircraft has been successfully tested in the UK in an important step towards cleaner low-carbon air travel.
NIST scientists have developed a novel method to rapidly and accurately calibrate gas flow meters, such as those used to measure natural gas flowing in pipelines, by applying a fundamental physical principle: When a sound wave travels through a gas containing temperature gradients, the sound wave's average speed is determined by the average temperature of the gas.