An Airship The Size of a Football Field Could Revolutionize Travel
What’s a bit surprising, though, is that the entire structure, when filled with helium, is actually heavier than air. While the weight ratio allows it to stay grounded without being tethered, only a small amount of forward speed is required to execute a take-off, thanks to unique wing-shape fins that give it an aerodynamic boost.
Once aloft, the aircraft can reach a maximum speed of about 100 miles per hour.
4. Couples look more similar after 25 years together
People who live with each other for 25 years may develop similar facial features. One study has found that over 25 years of marriage the facial features of couples became more similar, as judged by independent observers. This may be because of similarities in diet, environment, personality or even a result of empathising with your partner over the years.