SpaceX: Leaky Valve Culprit in April Crew Dragon Explosion

A leaky valve reportedly allowed propellant to enter high-pressure helium tubes some 100 milliseconds before the spacecraft’s thrusters were due to ignite. A slug of liquid oxidizer—known as nitrogen tetroxide (NTO)—wound up in a high-pressure system, resulting in a structural failure and, ultimately, an explosion, according to SpaceX. In partnership with NASA, the Federal Aviation Administration (FAA), and the National Transportation Safety Board (NTSB), the aerospace manufacturer led an investigation into the “anomaly.” It helps that the blast happened on land, leaving behind debris and intact parts that are easier to examine than, say, components lost in outer space or scattered across an ocean. The ruined rocket was a test version of SpaceX’s Crew Dragon—a capsule being built for NASA to take astronauts to and from the International Space Station. This particular module was the first Crew Dragon launched into space: In March, the unoccupied vehicle successfully docked with the ISS, before splashing down in the Atlantic Ocean in a flawless test mission. A month and a half later, the spacecraft detonated, sending clouds of orange gas into the Florida sky. “It is worth noting t...

Turn to Facebook, your neighbor — hell, a random person on the street — and you’re bound to hear

Turn to Facebook, your neighbor — hell, a random person on the street — and you’re bound to hear about the essential oil that wiped out their skin condition or helped them kick a nasty cold. Simply put, essential oils are kind of a big deal.  “Scent is tied to memory more than any of our senses,” says Emilie Hoyt, the founder of LATHER. “It has an incredible power to affect our mood and well-being.” The obvious next step is shopping for them. “To ensure that you’re getting the highest quality, look for Clinical Grade pure essential oils with the Latin name of the plant on the packaging and a notation of ’100% Pure,’” says Barbara Close, a certified herbalist, esthetician, and aromatherapist, as well as the founder of Naturopathica. “Pure essential oils will be stored in dark (amber or cobalt blue) glass bottles to protect the oil from degrading with exposure to light. Finally, be wary of low price tags. Most essential oils require large amounts of plant material to produce a single oz., so the price should be proportionate.” Once that’s checked off your to-do list, you need to learn how to actually use them ...