worst

Introducing Airbnb’s Latest Designation for Its Best and Worst Accommodations

Airbnb Top Home Highlight
Airbnb already has labels like “Guest favorites” and “Superhost” to indicate the quality of a property or the host. Now the company is adding a new label for the top 25% and top 1% properties on the listing page. Usually, Airbnb releases updates twice a year with so-called winter and summer releases. Airbnb said today that nearly 1.5 million properties would be verified by the end of this month in these five markets with a verification badge shown next to the listings. Airbnb said that it plans to add photo and video verification tools for hosts to verify their listings.

The Devastating Dilemma of Valves for Spacecraft Engineers

Spacecraft Valves
Valves play a critical role in the spacecraft’s architecture, regulating the flow of pressurents like helium and propellants. “There’s a thousand different ways you can make a valve unhappy,” said Jake Teufert, CTO of Benchmark Space Systems, a Vermont-based startup developing propulsion systems for spacecraft. Valves must also have ultra-low leakage requirements; Teufert said that some valves have allowable leakage rates equivalent to leaking only one gram of helium over the course of 200 years. Engineers run spacecraft through a host of tests on the ground, but the flight environment can only be matched to an extent, Teufert explained. But adding two valves (or any additional subcomponents) can create whole new failure modes that you would never have with one valve.