9 billion people: Earth’s population by 2050
41 percent: the portion of people treated for cat bites who were diagnosed with depression, according to a study of 1.3 million health records
12 to 14 hours: the length of time a newly discovered marsupial spends violently mating. Most of the males die from internal bleeding and tissue damage before the resulting offspring are born.
130 miles: the distance this electric snow-chainsaw can haul a person on an eight-hour charge
2018: the year this supersonic plane, which will have a livestream of the outdoors instead of windows, is set to launch
$50: the price of a printed circuit board that lets you create electronic music from any object (see more geeky toys from the 2014 Toy Fair here)
8 percent: the propulsive efficiency of a bat
$16,000: the cost to turn a 1988 Ford Fiesta into a Transformer
20 miles per hour: the top speed of a bike retrofitted with this electric rear wheel
14,000 people: are killed by the gut infection Clostridium difficile per year. Poop transplants can help.