https://www.vice.com/en_us/article/mbmvby/the-top-secret-air-force-x37b-has-been-orbiting-earth-for-719-days

The Pentagon’s X-37B space drone broke a record yesterday for orbiting above planet Earth for 719 days straight, beating its own previous record of 717 days.

What's that, you say? You didn't know that the US military has been flying a drone in orbit around the Earth for almost two consecutive years? Well, here's another nugget for you: we don't know what it's doing because the mission is classified.