57 years: Age of Alan Eustace, the Google executive who dove through the upper stratosphere.

40 billion: Number of habitable worlds scientists believe may exist in our galaxy.

98,000: Number of new Ebola cases that could hit Liberia soon without immediate assistance. 

149 mph: New speed record for driverless cars. Audi says an automated RS7 hit the mark on a closed course. 

4 years: Time Darek Fidyka spent paralyzed after getting stabbed in the back. An injection of brain cells to his spine helped him walk again.