Police say seatbelts saved the lives of two people who crashed their $300,000 supercar in the Nevada desert, but the vehicle’s engineers deserve a fair share of the credit. The Nevada Highway Patrol found the totaled McLaren 720 about 70 yards off a road near Lake Mead last week, with damage suggesting that it had rolled at least once as it just missed falling down a ravine. The 710 horsepower coupé is one of the quickest cars in the world, and has a top speed of 212 mph. It features a carbon fiber passenger cell, similar to a racecar’s, that’s...