Help scientists find new black holes with this free smartphone app 

 Developed by the Dutch Black Hole Consortium, the Black Hole Finder app allows the public to help sort through thousands of images to identify potential targets of interest. 

https://cdn.mos.cms.futurecdn.net/24X8SRAY6mzsEzXMGiiPAL.png

https://www.space.com/black-hole-finder-smartphone-app